It pays to check the ingredients!

This is an average sweet red plonk that I bought to cook with. Tasted OK, then I was intrigued to note that in the ingredients, it had milk products and egg shells. How on earth deos a wine end up with these ingredients. As I am allergic to dairy, it will end up as drain cleaner now. Would not buy on principle anyway. I like my wine to be..... well wine!