Chicken-and-Brisket Brunswick Stew

INGREDIENTS

• 2 large onions, chopped
• 2 garlic cloves, minced
• 1 tablespoon vegetable oil
• 1 1/2 tablespoons jarred beef soup base
• 2 pounds skinned and boned chicken breasts
• 1 (28-oz.) can fire-roasted crushed tomatoes
• 1 (12-oz.) package frozen white shoepeg or whole kernel corn
• 1 (10-oz.) package frozen cream-style corn, thawed
• 1 (9-oz.) package frozen baby lima beans
• 1 (12-oz.) bottle chili sauce
• 1 tablespoon brown sugar
• 1 tablespoon yellow mustard
• 1 tablespoon Worcestershire sauce
• 1/2 teaspoon coarsely ground pepper
• 1 pound chopped barbecued beef brisket (without sauce)
• 1 tablespoon fresh lemon juice
• Hot sauce (optional)