Braised Kale and Tomatoes

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3 to 4 tablespoons olive oil

1 yellow onion, chopped 

1/2 teaspoon red pepper flakes 

3 cloves garlic, roughly chopped 

2 bunches curly kale, cleaned well, center stems removed, and torn 

Kosher salt and freshly ground black pepper

Kosher salt and freshly ground black pepper 

2 cups whole peeled tomatoes

3/4 cup chicken stock