For the sandwiches
01 -
8 slices sturdy sourdough bread
02 -
6 oz (170 g) low-moisture mozzarella, shredded or thinly sliced
03 -
4 oz (115 g) feta cheese, crumbled
04 -
2 packed cups (60 g) baby spinach
05 -
1 medium Roma tomato, thinly sliced and patted dry
06 -
1/4 cup (35 g) Kalamata olives, chopped
07 -
2 tablespoons finely chopped red onion
08 -
1/3 cup loosely packed fresh basil leaves, torn
09 -
1 small garlic clove, minced
10 -
1/4 teaspoon dried oregano
11 -
Freshly ground black pepper
For grilling
12 -
3 tablespoons extra-virgin olive oil, divided