Does anyone know the name of the sauce that comes in a little box used for Albondigas?

An old friend of mine came from Mexico and brought a few of those little boxes. She made albondigas (meat) with an egg in the middle over white rice and used that sauce over it. It was so delicious and I have never seen that sauce since or anywhere in the supermarkets here in the states. Please help if you know the name and where I can buy some. The taste is absolutely delicious. Thanks!