Preheat sandwich press, or prepare a frying pan with a small amount of cooking oil spray. Set aside.
Spread the ricotta cheese over the focaccia bases. Layer with the peppers/capsicum pieces; tomato slices; mozzarella slices; parmesan cheese and basil leaves. Season with salt (if you wish).
Spread the tomato paste over the focaccia tops, and sandwich them over the cheese. Grill in the preheated sandwich press or on the frying pan, (for about 5 minutes for sandwich press; or 4 minutes each side for frying pans), until toasted, heated through and cheese has melted.
Notes
For extra gooey melted cheese, use thick slices of mozzarella, the thicker the slice, the gooier the cheese melt!