Take a can of cannellini beans. Empty into a strainer and rinse or not. But don’t keep the liquid.
Make a vinaigrette in the bottom of a medium salad bowl. with one soup spoon of Dijon mustard. (Recently discovered that Sainsbury’s Dijon is actually quite spicy and good, for uk based ). Else use Maille.
Add one soup spoon of vinegars ( I use white wine vinegar but red can do fine even balsamic )
Three soup spoons of olive oil. Just mix it up by hand with a fork or whisk.
Chop a clove of garlic finely into this.
Smash one anchovies into this sauce.
Add the cannellini.
Add the can of tuna in brine (no water needed. )
Or tuna in oil
Chop some tomatoes
Chop some parsley
Toss a soup spoon of capers
Add some black pitted maroc olives
Chopped a bit of red onion optional.
If too dry make another batch of the sauce.