Caesar Salad Soup: A Creamy Lettuce Soup

If you’ve never thought of cooking lettuce, you’re not alone.

Most of us think of lettuce as something that belongs in a salad, tucked into a sandwich, or piled onto a burger. But lettuce—especially sturdy romaine—is surprisingly delicious when cooked.

And it’s one of my favorite ways to use up an abundance of romaine from the garden.

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Can You Really Make Soup With Lettuce?

Yes!

This Caesar Salad Soup is not really a salad at all. It’s a warm, creamy lettuce soup with all the familiar flavors of Caesar dressing: garlic, Parmesan, lemon, Worcestershire sauce, and just a little anchovy.

When romaine is cooked, it softens considerably and loses the crisp texture we associate with a salad. Once it is blended with the broth and creamy dressing mixture, it becomes a smooth, velvety soup.

The flavor is mild and savory, with the Parmesan, garlic, lemon, and Worcestershire sauce giving it that unmistakable Caesar-style flavor.

If you have never cooked lettuce before, this is a wonderful recipe to try.

And if you grow your own greens, it’s even better.

Grow Your Own Soup

One of the things I love about gardening is discovering new ways to use something I’ve grown.

Romaine is one of those vegetables that can give you a surprisingly generous harvest. When the weather is right, I can keep picking fresh greens from my garden and finding new ways to put them on the table.

That makes this soup especially handy.

You don’t need a perfect head of romaine for this recipe. In fact, it’s a great way to use extra lettuce when you’ve harvested more than you can eat in salads.

If you’re growing greens, don’t limit yourself to thinking about salads. Lettuce, kale, Swiss chard, spinach, mustard greens, and other leafy vegetables can all give you plenty of possibilities for the kitchen.

Lettuce Is a Cool-Season Vegetable

One of the reasons I love growing lettuce is that it gives me a harvest when many of the warm-season vegetables in the garden are slowing down.

Lettuce is a cool-season vegetable, which means it generally does best when temperatures are mild rather than extremely hot. That makes it a wonderful crop for spring and fall gardens, and in warmer climates, you may be able to grow it through much of the winter.

Related: 22 Best Cool Season Vegetables To Grow In Your Garden

And when your lettuce is growing well, you may find yourself with more than you can eat fresh.

That’s where this soup comes in.

Can You Freeze Lettuce for Soup?

Yes!

You probably don’t want to freeze lettuce if your plan is to use it later in a salad. Freezing breaks down the delicate structure of the leaves, so thawed lettuce won’t have that crisp texture we love.

But if you’re planning to cook the lettuce, that’s not a problem at all.

I like the idea of freezing extra lettuce specifically for soups and cooked dishes. Wash it well, dry it, chop it, and freeze it in a freezer-safe bag or container. When you’re ready to make soup, you can add the frozen lettuce directly to the pot.

It won’t have the texture of fresh lettuce, but once it’s cooked and blended into soup, you won’t notice the difference.

It’s a simple way to preserve some of that garden abundance for later in the year.

🌼 From Mary’s Backyard
This is one of those little garden tricks that can save a harvest from going to waste. If I have more lettuce than we can eat, I don’t have to force ourselves to eat salad every day just because the garden is producing.

Some goes into the refrigerator for fresh eating, and some can be saved for soup.

That’s one of the things I love about growing food—finding ways to make the harvest work for us instead of letting a bumper crop become a problem.

Related: How to Grow Greens in Your Garden All Year

What Does Caesar Salad Soup Taste Like?

Think of a creamy vegetable soup with the savory flavor of Caesar dressing.

The romaine itself has a fairly mild flavor, so the garlic, Parmesan, Worcestershire sauce, lemon, and anchovy paste do most of the flavor work.

And don’t be afraid of the anchovy paste.

You don’t end up with a fishy soup. Anchovy is traditionally used in Caesar dressing because it adds a deep savory flavor. A small amount gives the soup that extra something without announcing, “This soup contains anchovies!”

If you don’t have anchovy paste, you can leave it out. The soup will still be delicious.

What You’ll Need

The ingredients are simple:

• Bacon
• Onion
• Garlic
• Romaine lettuce
• Chicken or vegetable broth
• Worcestershire sauce
• Anchovy paste, optional
• Black pepper
• Salt
• Hot sauce
• Cream
• Mayonnaise
• Lemon juice
• Crusty bread
• Olive oil
• Parmesan cheese

The bacon serves two purposes. It gives the soup a little smoky flavor, and the bacon drippings are used to sauté the onion and garlic.

If you’d rather not use bacon, you can sauté the vegetables in olive oil or butter instead.

Can You Make Caesar Salad Soup Vegetarian?

Absolutely. This soup is easy to adapt for a vegetarian meal.

Start by replacing the chicken broth with vegetable broth. Instead of cooking bacon and using the bacon drippings, sauté the onion and garlic in a little olive oil or butter.

Leave out the anchovy paste and make sure you’re using a vegetarian Worcestershire sauce, since traditional Worcestershire sauce often contains anchovies. You can also use a small splash of soy sauce or tamari to add some of that savory, umami flavor.

The Parmesan and creamy dressing mixture still give the soup plenty of flavor, so you won’t feel like you’re missing anything.

For vegetarian croutons, simply use your favorite crusty bread, olive oil, garlic, and Parmesan.

Want to Make It Vegan?

You can take it one step further by using vegetable broth, olive oil, a plant-based cream, vegan mayonnaise, and a dairy-free Parmesan substitute. Leave out the anchovy paste and use a vegan Worcestershire sauce or another savory seasoning.

The result will be a little different from the original, but you’ll still have a warm, creamy way to enjoy your garden-grown romaine.

How to Make Caesar Salad Soup

Start by cooking the bacon until crisp. Remove it from the pan and set it aside for the garnish.

Cook the chopped onion and garlic in the bacon drippings until the onion begins to soften.

Add the broth, Worcestershire sauce, anchovy paste if you’re using it, black pepper, salt, and hot sauce.

Then comes the part that may feel a little strange the first time you make this recipe.

Add the chopped romaine.

Cover the pot and let the lettuce cook until it is completely wilted, stirring occasionally. It doesn’t take long.

Once the lettuce is tender, let the soup cool slightly before blending.

Blend the soup until smooth. If you’re using a traditional blender, work in batches and be careful when blending hot liquids.

Now mix together the cream, mayonnaise, and lemon juice. Reserve a little of this mixture to drizzle over the finished soup, then stir the rest into the blended soup.

Warm everything through, but don’t bring it to a boil.

Crumble the bacon over the top and finish with Parmesan.

Don’t Skip the Croutons

Technically, you could serve this soup without the croutons.

But why would you?

The crunchy bread is a wonderful contrast to the silky soup.

Slice some crusty Italian bread on an angle and cut the slices in half. Brush them with olive oil and sprinkle with minced garlic. Toast until crisp, then add a little shaved Parmesan.

You can serve them alongside the soup or float one right on top.

🌼 From Mary’s Kitchen
If you want beautiful, wide shavings of Parmesan, don’t grate the cheese.

Use a vegetable peeler to shave the block of Parmesan into thin strips.

It’s simple, and those big curls of cheese make the soup look extra special.

Make It a Meal

This soup makes a lovely first course, but it can also become dinner.

For a heartier meal, add cooked chicken or shrimp to the finished soup. You could also serve it with crusty bread and a simple protein on the side.

Or keep it light and enjoy a bowl with one of those garlic-Parmesan croutons.

It’s especially good when you want something comforting without spending a long time in the kitchen.

A Great Recipe for Garden Lettuce

I think this is one of those recipes that gardeners appreciate more than anyone.

When you’ve grown your own food, you don’t want every harvest to end up being prepared the same way.

A head of romaine can become a salad one day, sandwiches the next, and a warm bowl of soup when the weather turns cool.

That’s one of the joys of growing your own food. The garden doesn’t just give you ingredients. It gives you possibilities.

And sometimes those possibilities are a little unexpected.

So the next time someone tells you that lettuce is only for salads, make them a bowl of this soup.

I have a feeling they may change their mind.

🌼 From Mary’s Backyard
I especially love recipes like this when the garden is producing faster than we can eat.

A big bowl of fresh romaine looks like it needs to become salad, but sometimes you just want something warm. Turning some of that harvest into soup gives you another way to enjoy what you’ve grown—and another reason to plant a little extra.

From Garden to Bowl

Sometimes the best recipes come from looking at a familiar ingredient in a completely different way.

Lettuce doesn’t have to stay in the salad bowl. When you have a garden full of romaine, you can enjoy it fresh, freeze some for later, or turn it into a warm and comforting soup.

So the next time your lettuce is growing faster than you can eat it, don’t let that harvest go to waste.

Pick some, make some soup, and enjoy a little taste of your garden—even on a chilly day.

More You Might Enjoy

If you’re growing your own food, you might also enjoy these:

• How To Make Traditional Ratatouille Recipe
• The Best Hawaiian Coleslaw Recipe
• Fantastic Moussaka – A Mediterranean Recipe – Greece’s National Dish
• Sauteed Swiss Chard And Tomatoes
• Grow Greens In Your Garden All Year

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Happy Backyard Homesteading!

I believe everyone can grow at least part of their own food! Let me show you how.

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