French Onion Meatballs | TasteToronto

Ingredients

• 1 cup stale bread, cubed
• 2/3 cup whole milk
• 1 pound medium ground beef
• 1 small yellow onion, finely diced
• 3 cloves garlic, minced
• 1 tablespoon fresh chopped parsley
• 1 whole egg
• 1 teaspoon kosher salt
• 1 tablespoon unsalted butter
• 1 tablespoon olive oil
• 1/3 cup all-purpose flour
• 4-6 slices sourdough bread
• 1 cup Gruyere, grated (approximately 90 grams)
• 1 cup mozzarella, grated (approximately 90 grams)
• 1 cup (divided) Parmigiano-Reggiano, grated (approximately 100 grams)
• 2 tablespoons olive oil
• 2 tablespoons unsalted butter
• 5 cups thinly sliced yellow onions (approximately 500 grams raw and peeled)
• 2 bay leaves
• 1/2 teaspoon granulated sugar
• Kosher salt, as needed
• 2 garlic cloves, minced
• 1 teaspoon fresh thyme leaves, plus more for garnish
• 1/3 cup sherry
• 3 cups low-sodium beef broth
• 1 tablespoon red wine vinegar
• Fresh cracked black pepper, as needed