01 -
3-4 large sweet onions, sliced.
02 -
4 tablespoons salted butter.
03 -
1 tablespoon olive oil.
04 -
1 teaspoon sea salt.
05 -
1 teaspoon black pepper.
06 -
1 teaspoon sugar.
07 -
1 pound ground beef.
08 -
1 cup Italian herb breadcrumbs.
09 -
1 cup milk.
10 -
1 egg.
11 -
1 package French onion soup mix.
12 -
1/2 cup cooking sherry.
13 -
1/2 teaspoon Worcestershire sauce.
14 -
4 oz Swiss, Gruyère, or provolone cheese.
15 -
Fresh thyme for garnish.