Vegetarian "Southern-style" Collard Greens

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1 tablespoon olive oil

1 tablespoon butter

1/2 large onion, chopped

1 teaspoon red pepper flakes

1 clove garlic, finely chopped

1 pound collard greens, chopped

3 cups vegetable stock

2 tomatoes, seeded and chopped

Salt and freshly ground black pepper