Caprese Salad Sandwiches

8 slices artisan-style whole wheat bread

2 tablespoons white truffle oil, or to taste

½ pound buffalo mozzarella, thinly sliced

½ cup fresh basil leaves, or to taste

1 large heirloom tomato, thinly sliced

coarse sea salt and ground black pepper to taste

Drizzle each slice of bread evenly with truffle oil and cover 4 bread slices with slices of buffalo mozzarella cheese, basil leaves, and tomato slices. Season to taste with sea salt and black pepper. Top each sandwich with a remaining bread slice.