Tuna, Mushrooms and Beans

This recipe comes from the old-fashioned repertoire of many Italian restaurants over the last 30 years or so. ‘Tonno e fagioli’- tuna and beans - is mostly made with tinned tuna with some canned beans included. Adding some chopped onions is usually one way of reviving the basic mixture, but I thought some mushrooms would also add flavour, especially if pickled. I would use ‘ventresca di tonno’, the belly, which is the most tender and best tinned tuna available. The dish is very simple to pr