1 pie crust
(pate brisee tart dough for one 10 inch tart see method for making pate brisee or 1 packaged flat, trader joe s has one in their frozen section)
3 red onions
(sized)
2 tbsps olive oil
1 tbsp butter
salt
1 tsp balsamic vinegar
34 cup swiss cheese
(packed roughly grated gruyere)
Comments