French Onion Meatballs (Print Version)

# Ingredients:

01 - 2 big yellow onions (about 2 whole large or 4 smaller ones).
02 - A small handful of fresh thyme sprigs.
03 - 2 minced garlic cloves.
04 - 6 oz Gruyère cheese, shredded.
05 - 1/2 cup of panko crumbs.
06 - Half a cup of 2% or whole milk.
07 - An egg, large size.
08 - 2 teaspoons of Worcestershire sauce.
09 - 2 1/2 teaspoons kosher salt.
10 - 3/4 teaspoon ground black pepper.
11 - 1 1/2 lbs ground beef.
12 - 2 tablespoons butter, unsalted.
13 - 2 tablespoons plain flour.
14 - 1/2 cup dry white wine.
15 - 14.5 oz beef stock.
16 - 1 teaspoon vinegar (sherry or balsamic works).

# Instructions:

01 - Move racks to the middle and upper spots, then preheat to 400°F. Cover a baking tray with parchment paper.
02 - Toss garlic, thyme, shredded cheese, breadcrumbs, milk, an egg, Worcestershire sauce, and seasonings into a bowl. Gently mix in the beef. Roll into 32-34 small meatballs.
03 - Arrange the meatballs on the baking tray. Cook for 15-20 minutes, making sure the center hits 165°F.
04 - Sauté onion slices in butter with thyme, salt, and pepper until they turn a rich golden shade. Stir in flour, then pour in the wine. Cook until the wine disappears.
05 - Simmer the broth until it thickens a bit. Stir in vinegar and taste to tweak the flavor if needed.
06 - Toss meatballs into the sauce, sprinkle cheese on top, and broil for 3-4 minutes until bubbly and melty. Add sprigs of thyme before serving.

# Notes:

01 - Mix your meat gently for softer meatballs.
02 - Pair this dish with crusty bread to mop up the sauce.