Add the Beyond Beef and garlic to the onions and cook until lightly browned, around 8 – 10 minutes. Add in the mushrooms, carrots and celery and cook for 10 - 12 minutes until your vegetables are soft. Sprinkle with the flour and cook for 3-5 minutes, stirring. Add the Worcestershire, ketchup, thyme and stock and stir, cooking until the sauce thickens. Season with salt and pepper to taste. Remove from the heat and stir in the frozen corn and peas.