User blog comment:D2r/Unanswered Questions of Redwall/@comment-8072-20100125014741

Ask Brian #129. If Redwallers are mainly vegetarian, eating no animal products other than fish, then how is it possible for them to create cheese or custards without the aid of dairy products which would come from animals other than the latter?

Green sap milk is my solution. The sap of many plants can be used to make vegetarian versions of milk, cream, butter and cheese.