If your bun is large, use only one halve by cutting it in half to make a small sandwich.
Spread pesto on both sides of bun and lay the mozzarella on both halves.
Place whole basil leaves and tomato slices on one half of the bun and top with the other half of the bun (tomato and basil should be sandwiched between mozzarella).
Use a panini press to grill the sandwich for 2-3 minutes until cheese melts (see "Notes" below).
Calories from fat195
Calories from saturated fat45
Total Fat21.7 g
Saturated Fat5.0 g
Polyunsaturated Fat1.3 g
Monounsaturated Fat1.2 g
Total Carbohydrate45 g
Dietary Fiber3.8 g
If you don't have a panini press you can put the sandwich in a frying pan on medium heat and place a pot/pan onto the sandwich with something heavy in it to squish it down. Toast for 2-3 minutes then flip the sandwich using the pot/pan to squish it down again.