These are about as far from Grandma's cucumber sandwiches as you're going to get. These babies will light up your spread with their fluorescent red and green color. Don't worry, there's nothing toxic here, it's just red horseradish, cucumber, scallion, and dill. The dill complements the cucumbers perfectly, and the scallions and horseradish give the sandwich some really good kick. My friends go through these things like water because they're so light and poppable. I've learned to make a double batch so I don't wind up back in the kitchen to make more of these during the party.