Tuna and Borlotti Bean Salad with Balsamic Roasted Onion’s Recipe

Tuna and beans are one of my favourite combinations and the roasted sweet red onion makes this salad really delicious. I love the bursts of flavour you get from the olives and capers and the tarragon adds freshness and a nice flavour. I think this will be a firm favourite in our house. Ingredients (serves…