Layer panini as follows
Slice of artisan bread (really good with La Brea Rosemary Olive Oil Loaf)
Slice of fresh mozzerella
sliced tomatoes (preferably roma)
sprinkle of fresh basil
drizzle of balsamic vinegar
Second slice of bread
Grilled chicken is also good in this sandwich.
Brush exterior with olive oil and grill on panini maker until bread is crisp and brown and cheese is melted.