Cut the broccoli into florets and boil it with the pasta in salted water until the pasta is cooked
In a separate oven-proof, heavy-based saucepan fry the onion and garlic until soft and golden
Add the diced red pepper and corn and season with a little salt and pepper
Drain the tuna and add it to the saucepan and mix
Add the stock pot and let it dissolve with the heat of the pan
When the pasta is cooked add a little pasta water to the pan to loosen the mix
Drain the pasta shells and broccoli and add them to the saucepan with the tuna mix
Add a good dollop of creme fraiche (or cream cheese)
Sprinkle the crushed crackers and grated cheddar on top and drizzle with the melted butter
Place under the grill until bubbling and golden