Sloppy Joes with Red Lentils

Ingredients

• canola oil, for cooking
• 1 small onion, peeled and chopped
• 2 garlic cloves, crushed
• 1 - 1 1/2 lb. lean ground beef or bison
• 1-2 cups tomato sauce or diced tomatoes
• 1/3 cup ketchup
• 2 Tbsp. cider or red wine vinegar
• 2 Tbsp. brown sugar
• 1 Tbsp. Worcestershire sauce
• 1/4 cup dry red lentils
• Salt
• pepper
• 4 soft buns, cheese buns, or biscuits