This is pretty simple. Saute a small chopped onion in some olive oil.
Add 1/2 cup white wine, a 200g cherry tomatoes, a handful of basil leaves and 1 tbsp green peppercorns. Simmer until for 3-4 minutes, then add other chopped vegetables. (I used kale and yellow squash from our garden). Continue to simmer until the liquid has reduced by half.
Add 1 medium can of tuna and 1 tbsp small capers, black pepper and salt, 1 tbsp fresh dill, chopped.
Serve with pasta and crumbled feta and some fresh basil leaves on top.