fine sea salt
In a food processor combine everything but olive oil. Pulse to chop. With machine running, add olive oil in a thin, steady stream until combined.
focaccia, divided widthwise
romaine lettuce, shredded
jarred pickled hot peppers, drained and sliced
vegan provolone cheese
Spread pesto on both sides of focaccia. Top bottom half with everything. Close sandwich with top half of focaccia.
Preheat a nonstick skillet over medium heat. Griddle sandwich, pressing on it with a spatula or heavy grill press, until crispy and browned on both sides (~3 mins per side).