INGREDIENTS
Extra-virgin olive oil
1 small onion, finely diced
2 pounds zucchini, sliced into 1/4-inch-thick pieces (for larger zucchini, cut in half lengthwise before slicing)
Salt and pepper
2 garlic cloves, minced, or 2 tablespoons chopped green garlic
1 ounce basil, about 2 cups loose leaves
1 pound ziti or other dry pasta
8 ounces ricotta, about 1 cup
Pinch of crushed red pepper
Zest of 1 lemon