Melba sauce is a raspberry sauce used for desserts.
The base is fresh raspberries that are puréed and then strained to remove all seeds. Red currant jelly, sugar and cornstarch are then added, and the mixture is simmered until the cornstarch has cooked and thickened the sauce.
It can be served warm or cold.
You can also buy it ready-made in jars.
The sauce was invented for peach melba, but you can use it on anything. Some recipes confuse the sauce with the dish, and add peaches right into the sauce.