French Onion Dip Sandwiches (Slow Cooker)

French Onion Dip Sandwiches (Slow Cooker) was pinched from <a href="https://www.allrecipes.com/recipe/261464/french-onion-dip-sandwiches-slow-cooker/" target="_blank" rel="noopener">www.allrecipes.com.</a>
INGREDIENTS
5 tablespoons olive oil, divided
2 large onions, thinly sliced
3 tablespoons butter, divided
1 teaspoon white sugar
1/2 teaspoon salt
3 cloves garlic, minced
9 tablespoons water
1/4 cup dry vermouth
2 1/2 cups beef stock
1 tablespoon Worcestershire sauce
1 tablespoon soy sauce
1 teaspoon fresh thyme
1 bay leaf
1/4 teaspoon ground black pepper
3 pounds rump roast
salt and ground black pepper to taste
8 French rolls, split
1 (6 ounce) package grated Gruyere cheese
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