(makes 1 sandwich)
3 tablespoons spinach (aka spanakopita) pesto
1/4 cup graviera or gruyere (grated)
2 slices bread
1 tablespoon butter
Assemble sandwich and grill until the cheese has melted and the bread is golden brown on both sides, about 2-4 minutes per side.
http://www.closetcooking.com/2010/05/spinach-pesto-grilled-cheese-sandwich.html