Meatloaf Sandwiches

1 tablespoon olive oil 1 red onion , diced small 2 tablespoons tomato paste 2 garlic cloves , minced 1 egg 1 tablespoon Worcestershire sauce 1 tablespoon[...]

2 teaspoons olive oil 1 red onion , chopped 1 zucchini , shredded 3 carrots , shredded 1 yellow bell pepper , chopped 1 celery , chopped 8 mushrooms , chopped[...]