For the sandwich
01 -
2 slices thick sourdough bread, about 2 oz (55 g) each
02 -
1/2 ripe avocado, sliced or lightly mashed
03 -
2 slices ripe tomato, blotted dry
04 -
3 oz (85 g) low-moisture mozzarella, sliced
05 -
2 fresh basil leaves, torn, optional
06 -
1 tablespoon (14 g) unsalted butter, softened
07 -
1/8 teaspoon kosher salt, plus more as needed
08 -
Freshly ground black pepper, to taste