- Heat a large sautee pan over medium heat. Add the olive oil, onion, salt, pepper and red pepper flakes. Slowly caramelize the onions, about 10-15 minutes stirring occasionally.
- When the onions are golden brown and caramelized, add the rainbow chard. Toss with the onions. Cook until the chard just begins to soften, about 2-4 minutes. Add the juice from the orange. Toss, and cook another 2 minutes. Taste for salt and pepper. Serve warm.