ciabatta burger 1 ½ lbs ground beer1 onion (sliced thin)5 tbl olive oil (divided)1 tbl butter4 ciabatta rolls4 slices mozzarella cheese1 tomato1 bag arugula2 tbl tomato paste4 tbl balsamic vinegar1 clove garlic (minced on a microplane)1 tsp sugarsalt & … [Read more...] about ciabatta burger