This is based on the classic Italian tuna and bean salad, but I’ve gone further. If you have time to toss the beans with the dressing a few hours before you want to assemble and serve, do it.
The beans taste wonderful once they’ve marinated for a while. You can roast the peppers yourself or use ready-cooked ones from a jar.
The quality of the tuna and the anchovies is very important. I use jarred Ortiz tuna or canned Charles Basset (the latter isn’t as good but it’s cheaper).
Waitrose also do very good own-label jarred tuna in olive oil. This means it’s not a cheap meal, though, as good canned tuna is expensive.
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