Edamame without beans dates hearts

1 medium onion , chopped 2 tablespoons canola oil 1 medium orange bell pepper , diced 1 medium red bell pepper , diced 1 medium yellow bell pepper , diced 2[...]

2 tablespoons unsalted butter 2 tablespoons finely chopped green onions 2 tablespoons lime juice 2 tablespoons soy sauce 1 tablespoon maple syrup 2 teaspoons[...]