"Shhh. It's really just zucchini...."
extra-virgin olive oil
medium onion, chopped
garlic cloves, minced
Pinch crushed red pepper flakes
ground beef
Kosher salt
Freshly ground black pepper
tomato paste
dried oregano
(28-oz.) can crushed tomatoes
large zucchini, sliced into 1/4" coins
thinly sliced basil, plus more for garnish
fresh ricotta
shredded mozzarella
freshly grated Parmesan