Spicy Beef

2 1/2 pounds clementines 1 to 2 tsp. red chile flakes 3 tablespoons coarsely chopped fresh ginger 4 garlic cloves, peeled 1 teaspoon kosher salt 3 tablespoons[...]

1 tablespoon canola oil 12 ounces flank steak, cut diagonally across the grain into thin slices 1 red bell pepper, cut into thin strips 1 yellow bell pepper,[...]