Three interchangeable versions of the same bowl — white bean & tuna, black bean & corn, or chickpea & roasted pepper — all sharing one creamy mayo-yogurt dressing. Ready in 15 minutes. Keeps well.
Use lime juice instead of lemon in the dressing for this version.
Drain the beans (or chickpeas) into a colander and rinse well under cold water. Shake off the excess. Pat dry with a clean towel if you want them to grip the dressing better rather than dilute it.
Halve the tomatoes, dice the cucumber into 1–2 cm pieces, and finely slice the red onion. If the onion is very sharp, soak in cold water for 5 minutes to mellow it. For Option B, thaw corn fully and drain any liquid.
In a small bowl, whisk together the mayonnaise, yogurt, lemon juice (or lime for Option B), Dijon, salt, and pepper until smooth. Taste — it should be creamy, slightly tangy, and well-seasoned before it goes on the beans.
Tip the beans and all the prepped vegetables into a large bowl. Pour over the dressing and toss gently to coat. For Option A, fold in the drained tuna in large flakes — don't break it up too much. For Option B, add the corn. For Option C, add the roasted peppers and olives.
Scatter over the fresh herbs. Taste and adjust — more lemon, salt, or a splash of olive oil if it feels flat. Serve straight away or cover and refrigerate. If making ahead for meal prep, keep the dressing separate and toss just before eating.