This section is from the book "Mrs. Rorer's Vegetable Cookery And Meat Substitutes", by Sarah Tyson Rorer. Also available from Amazon: Mrs. Rorer's Vegetable Cookery And Meat Substitutes.......
Pick a good-sized basket of fresh sweet clover. Be sure that it is free from sand. Put a thick layer in a large stone crock. Lay over this a pound of sweet butter wrapped in cheesecloth. Spread over more clover. Trim the crust from a loaf of bread, put it in the crock and cover it with a liberal quantity of clover; cover the crock and stand it in a cold place over night. When wanted for use make the same as bread-and-butter sandwiches. These are usually cut into three strips - what are called "finger" sandwiches.
Violet and rose sandwiches are made the same, except a few petals of the flowers are spread over the butter.