Spread the bread with the tomato pizza or pasta sauce. Scatter torn mozzarella and a few torn basil leaves over one slice, then add any meat or veggies you like – shredded chicken or ham, pepperoni, sweetcorn, onions or roasted peppers all work well. Top with the other slice of bread, then butter the outsides of the sandwich. Cook in a hot pan, weighed down by another heavy pan, for 2-3 mins on each side until the outside is crisp and the cheese has melted. Alternatively, cook in a sandwich toaster. Top with a few whole basil leaves and serve.