Puff Pastry Pizza Pockets

1 sheet of chilled ready rolled puff pastry

6 tbsp red pesto or pizza sauce

100g red or white grated cheddar cheese

3 small tomatoes, finely diced

½ red pepper, finely diced

Pepperoni, ham, or rashers, finely diced

Handful of freshly chopped basil

1 egg beaten

Salt and freshly ground pepper

3 tbsp sesame seeds (optional)