Ingredients
1 lbs ground beef
1-2 teas Worcestershire sauce
1 teas fresh snipped parsley
1/2 teas fresh thyme
1/2 teas garlic salt, plus a dash
1/4 teas pepper
2 tbs olive oil
1 onion, sliced
2 tbs white wine
sliced Gruyere cheese
1 tbs coarse grain mustard
1 tbs mayo
Preparation
