I haven’t found an all natural red food coloring, but I use it so infrequently and in such small quantities, that I just use the products available in the supermarket and baking supply stores. There is a company called LycoRed that has come up with a red food coloring based on tomatoes that is being used in food applications. I haven’t seen it available for consumers yet, but hopefully they’ll soon decide to sell it to consumers for baking.