In a blender, combine the coconut milk, curry paste, soy sauce, sugar and peanut butter. Blend until smooth. Taste and add the salt, if desired. Taste and add more curry paste if you prefer your peanut sauce spicier.
Make stir-fry. Add enough peanut sauce to coat the vegetables, toss and stir-fry for 1 minute to heat through. Serve with steamed rice or noodles.