Slow-Cooker Brisket and Onions | America's Test Kitchen

Ingredients

• 1 tablespoon vegetable oil
• 3 large onion (about 2 pounds), halved and sliced 1/2-inch thick
• 1 tablespoon light brown sugar
• Salt
• 1 tablespoon tomato paste
• 2 tablespoon all-purpose flour
• 3 cloves garlic, minced
• 1 3/4 cups low-sodium chicken broth
• 2 tablespoons red wine vinegar (plus 1 teaspoon)
• 1 tablespoon paprika
• 2 teaspoons onion powder
• 1 teaspoon garlic powder
• 1/8 teaspoon cayenne pepper
• 1 beef brisket (5-pound) flat-cut, trimmed of excess fat
• 3 sprigs fresh thyme
• 3 bay leaves