- 1 medium-large sweet onion such as Vidalia or Walla Walla
- olive oil for brushing onion and tortillas
- four 6- to 7-inch flour tortillas
- 3/4 cup grated Monterey Jack cheese with hot peppers (about 3 ounces)
- 1/4 cup packed fresh coriander sprigs, washed well, spun dry, and chopped coarse.
- Prepare grill.
- Cut onion crosswise into 1/4-inch-thick slices and arrange slices on a tray, keeping them intact. Brush both sides of slices lightly with oil and season with salt and pepper. Grill onion on a lightly oiled rack set 5 to 6 inches over glowing coals 4 minutes on each side, or until lightly charred and softened. Transfer onion as grilled to a bowl, separating rings.
- Brush 2 tortillas lightly with oil on one side and put, oiled side down, on a platter. Divide onion, Monterey Jack, and coriander between tortillas and cover with remaining 2 tortillas. Brush tops of quesadillas lightly with oil.
- With a metal spatula transfer quesadillas to a rack set 5 to 6 inches over glowing coals and grill until undersides are golden brown, about 1 minute. Sandwiching each quesadillas between 2 metal spatulas, flip quesadillas over and grill until undersides are golden brown, about 1 minute.
- Transfer quesadillas to a cutting board and cut into wedges. Serves 2 as a light luncheon main coarse or side dish.