Moroccan Burger Salad

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2 6-inch pitas, split and quartered

1 pound lean ground beef sirloin

1 red onion (1/2 grated, 1/2 sliced)

3 tablespoons extra-virgin olive oil, plus more for the grill

2 tablespoons harissa (chile paste)

Kosher salt and freshly ground pepper

Juice of 1/2 lemon

2 beefsteak or heirloom tomatoes (about 1 pound), cut into 1-inch wedges

2 Persian cucumbers, sliced 1/2 inch thick

1/3 cup chopped fresh cilantro or mint (or a combination)

1 small heart romaine lettuce, torn

1/3 cup crumbled feta cheese (about 2 ounces)