tangy spiced brisket

INGREDIENTS

• 3 large onions, sliced
• 3 tablespoons vegetable oil
• 6 garlic cloves, peeled and halved
• 1 teaspoon paprika
• 2 teaspoons salt
• 1 1/2 teaspoons garlic powder
• 1 1/4 teaspoons black pepper
• 1 1/2 teaspoons onion powder
• 1/8 to 1/4 teaspoon cayenne (adjust to your heat preference)
• 1/2 teaspoon dried oregano
• 1/2 teaspoon dried thyme
• 2 cups beef stock (unsalted or low salt)
• 1 cup ketchup*
• 1 cup chili sauce* (I’m realizing from comments that there are many many types; I used Heinz, which is not exactly spicy)
• 1 cup brown sugar (light or dark)
• 8 to 10 pound brisket