Mozzarella Grilled Cheese Sandwiches

Ingredients
8 slices rye bread
4 quarter-inch slices of fresh mozzarella
3 plum tomatoes, cut into thick slices
1 cup fresh basil pesto (see recipe below or use the store-bought stuff)
Freshly ground black pepper
Extra-virgin olive oil

Basil pesto:
1/2 cup pine nuts
2 cups fresh basil leaves
1 cup fresh Italian parsley leaves
1/2 cup Parmesan or Romano
2 garlic cloves
1/4 teaspoon salt
1/2 cup extra-virgin olive oil

Directions:

1. Toast pine nuts in a skillet over medium heat until fragrant, about 5 minutes. Combine pesto ingredients in a food processor and pulse until well combined but still rough-textured.
2. If you have a panini press, turn it on to warm up; otherwise, set a skillet over medium heat. 
3. Assemble sandwich by smearing insides of bread slices with pesto. Arrange a layer of sliced tomato and season with a few turns of fresh pepper. Layer the mozzarella slices over the top and then place another piece of bread on top to make the sandwich.
4. Drizzle olive oil over skillet's surface and place sandwiches on the hot skillet or panini press. If using a skillet, place another heavy skillet over the top to form a "press". Turn after 2 to 3 minutes and replace weight. The sandwich is ready when golden brown and mozzarella has melted around the edges.

Notes: I really like pesto sauce, so I really enjoyed these grilled cheese sandwiches.

Source: An Edible Symphony