Greek Yogurt Tuna Salad in Endive Cups

Why this works for founders

Standard tuna salad is most of its calories from mayo. Swap in full-fat Greek yogurt and you keep the creaminess but more than double the protein and lose most of the seed-oil PUFAs from commercial mayo. Endive leaves replace bread and add bitter chicory compounds that have been linked in animal studies to bile flow improvements.

Ingredients (1 serving)

• 1 tin tuna in olive oil (drained)
• 3 tbsp full-fat Greek yogurt
• 1 tbsp dijon mustard
• 1 small celery stick, finely diced
• 2 tbsp finely chopped red onion
• 1 tbsp chopped capers
• 1 tbsp lemon juice
• A handful of fresh parsley or dill, chopped
• Salt, black pepper
• 1 head of endive, leaves separated

Steps

1. Mix tuna, yogurt, dijon, celery, onion, capers, lemon, herbs, salt, pepper in a bowl.
2. Spoon into endive leaves like little canoes.
3. Eat with your hands.

Macros per serving (approx)

• Calories: 320
• Protein: 36g
• Fat: 14g
• Carbs: 8g

Founder note

Holds 2 days in the fridge if you keep the tuna mix separate from the endive. The leaves go limp once filled.

The deeper logic

This dish is one of the higher-protein, lower-calorie lunch options
in the founder kit. Greek yogurt replaces mayonnaise (110 calories
per tablespoon of mayo, 8 calories per tablespoon of full-fat Greek
yogurt) without compromising creaminess. The tuna delivers
25 to 30 g of protein per tin. Endive leaves contribute the
fiber-and-crunch vehicle without the bread.

The total dish runs roughly 300 calories with 40 g of protein —
which is the highest-protein, lowest-calorie ratio achievable from
shelf-stable ingredients without supplementation.

Endive (Cichorium endivia, often labeled Belgian endive) is in the
chicory family. The bitter compounds — particularly lactucin and
intybin — have a small but documented effect on digestive function;
the bitter receptor activation in the upper GI tract triggers gastric
acid and bile flow. This is one of the few common vegetables that
genuinely supports digestion through bitter chemistry rather than
fiber alone.

Why this is the desk lunch

The dish is engineered around three constraints: no cooking, no
refrigeration during the eating window, and minimal cleanup. The
endive leaves are the plate-and-utensil combined; the tuna mixture
travels in a small Tupperware; the assembly is 60 seconds at the
desk.

The other use case is the lunch meeting where you cannot leave the
office for food. The endive cups are visually clean, do not drip,
and finish in 5 to 7 bites.

Substitutions

• No endive: small romaine leaves, butter lettuce cups, or
  small radicchio leaves. Endive is the recommended version for
  the bitter-and-crunch combination; substitutes lose one or
  both qualities.
• No tuna: tinned salmon (similar protein, more omega-3),
  rotisserie chicken shredded, or hard-boiled egg salad.
• No Greek yogurt: Skyr (Icelandic strained yogurt, higher
  protein), or quark. Avoid sour cream — the fat content
  flattens the macros.
• No dill: chives, fresh parsley, or fresh tarragon. Tarragon
  shifts the dish toward French; dill is more Scandinavian.

Storage detail

The tuna mixture holds 3 days refrigerated. The endive holds 5 to
7 days refrigerated wrapped in a damp paper towel. The full
assembly does not hold — the endive softens within an hour of
contact with the wet filling.

Pre-make the tuna mixture Sunday; assemble at the desk Monday
through Wednesday.

Common mistakes

• Using water-packed tuna. The flavor is thin and the dish reads
  one-dimensional. Olive-oil-packed tuna brings depth; drain
  most of the oil before mixing.
• Over-mixing the salad. The tuna should stay slightly flaky;
  over-mixing produces a paste. Mix until just combined.
• Pre-assembling the endive cups. The leaves wilt within 60
  minutes of the wet filling contact. Carry separately; assemble
  at lunch.

The desk lunch in the founder kit. Five minutes from fridge to
plate. Forty grams of protein.