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Keto Tuna Caesar Salad Cups

The Keto Tuna Caesar Salad Cups are a flavorful and satisfying dish made by filling crisp romaine lettuce leaves with a creamy, tangy Caesar-style tuna salad. A rich keto Caesar dressing made with mayonnaise, olive oil, Parmesan, lemon, garlic, and mustard coats flaky tuna for a high-protein, high-fat filling that stays low in carbs. The romaine hearts act as crunchy edible cups, giving you all the classic Caesar salad flavors and texture without croutons or sugary dressings. Ready in about 10 minutes, these bite-sized cups work for quick weeknight dinners, portable lunches, or elegant party appetizers while keeping macros keto-friendly and helping you stay full and energized.
Course Appetizer, Dinner, Lunch, Salad
Cuisine American, Mediterranean
Keyword Caesar Salad, keto, lettuce cups, low-carb, no cook, quick, tuna salad
Prep Time 10 minutes
Total Time 10 minutes
Servings 4 servings
Calories 260kcal

Equipment

  • Mixing bowl
  • Whisk
  • spoon
  • Paper towels
  • zester or grater

Ingredients

For the keto Caesar dressing

  • 1/4 cup mayonnaise preferably avocado oil or olive oil based
  • 2 tablespoons extra-virgin olive oil
  • 1/4 cup finely grated Parmesan cheese plus more for garnish
  • 1 tablespoon fresh lemon juice about 1/2 small lemon
  • 1 teaspoon Dijon mustard
  • 1/2 teaspoon Worcestershire sauce choose a low-sugar brand
  • 1 clove garlic finely minced or grated
  • 1/4 teaspoon anchovy paste optional for classic Caesar flavor
  • 1/8 teaspoon fine sea salt or to taste
  • 1/8 teaspoon freshly ground black pepper or to taste

For the tuna filling

  • 2 cans tuna packed in water 5 ounce cans, well drained
  • 1/4 cup finely grated Parmesan cheese
  • 2 tablespoons celery very finely chopped, optional for crunch
  • 1 tablespoon fresh parsley finely chopped, optional

For assembling the cups

  • 2 heads romaine hearts outer leaves removed, inner leaves separated and patted dry
  • 2 tablespoons shaved or grated Parmesan cheese for topping
  • 1 tablespoon fresh lemon juice or lemon wedges for serving
  • 1/8 teaspoon freshly ground black pepper for finishing

Instructions

  • Add the mayonnaise, olive oil, Parmesan, lemon juice, Dijon mustard, Worcestershire sauce, garlic, anchovy paste if using, salt, and pepper to a mixing bowl and whisk until smooth and creamy.
  • Taste the dressing and adjust the lemon juice, salt, and pepper to your preference, then set the bowl aside.
  • Add the drained tuna to a separate bowl and use a fork to flake it into small pieces so there are no large chunks.
  • Add the additional Parmesan, chopped celery, and parsley to the tuna and gently toss to combine.
  • Pour about half of the prepared Caesar dressing over the tuna mixture and fold gently until the tuna is evenly coated, adding more dressing a little at a time until it reaches your desired creaminess.
  • Taste the tuna filling and adjust seasoning with extra salt, pepper, or lemon juice as needed, then chill briefly if you prefer it very cold.
  • Separate the romaine hearts into individual leaves and trim any very wide pieces into more manageable cup shapes, then rinse and thoroughly pat dry with paper towels.
  • Arrange the dry romaine leaves on a platter so that each leaf forms a shallow cup ready to be filled.
  • Spoon a generous portion of the tuna Caesar mixture into each romaine leaf, keeping the filling toward the base and center so the cups are easy to pick up and eat.
  • Drizzle a small amount of any remaining Caesar dressing over the filled cups or reserve it on the side for dipping if you prefer less saucy cups.
  • Top the cups with shaved or grated Parmesan and a light sprinkle of black pepper, then finish with a squeeze of lemon juice just before serving.
  • Serve the tuna Caesar salad cups immediately while the romaine is crisp, or keep the filling and lettuce stored separately in the refrigerator and assemble just before eating.

Notes

For maximum crunch keep the tuna filling and romaine leaves separate until just before serving so the lettuce does not soften from the dressing. If meal prepping, store the dressing in a small jar, the tuna mixture in an airtight container, and the washed romaine wrapped in paper towels inside a container to stay crisp. You can swap canned tuna for canned chicken for a different twist while keeping the same Caesar flavors. To make the dressing even richer you can whisk in an extra tablespoon of olive oil, but add it slowly so the dressing stays thick. This recipe is naturally low in carbs, but always check labels on mayonnaise, Worcestershire sauce, and mustard to avoid added sugars that can add hidden carbs.

Nutrition

Calories: 260kcal | Carbohydrates: 3g | Protein: 19g | Fat: 20g | Saturated Fat: 4g | Cholesterol: 55mg | Sodium: 520mg | Fiber: 1g | Sugar: 1g