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In a small saucepan, heat the peanut oil over low heat. Add the minced scallions, peppers and the garlic, the cashews and sesame seeds and sauté for 3-5 minutes or until the scallions are golden brown, being very careful not to burn the cashews and sesame seeds. Add the peanut butter and stir until completely melted. Add the coconut milk and stir well to blend. Slowly add the water, stirring constantly until well blended. Season with salt and pepper to taste. Keep the sauté warm over very low heat while you prepare the pasta, stirring often so it does not separate.
Cook the angel hair as per package instructions.
Just before serving, add the dark green pieces of scallion to the sauce and stir well. Drain the pasta well and toss with the sauce. Serve immediately.