Slice the cucumber(s) in half across the width (horizontally). If you have a mandoline or a food processor that slices, use that to thinly slice the cucumber(s) horizontally (if you don't have either, use a sharp knife and cut as thinly as is safe).[a] In the jar of mayo, add the food coloring and mix until the color is even- if you don't use all of it here, you'll at least have interesting sandwiches at work or school for a bit! Take about 4 tbsps of the colored mayo, put it in a snack baggie, and set aside in the fridge. Spread the mayo from the jar over two slices of bread, and sprinkle the mayo lightly with the "funeral bouquet" (nasturtiums) or "grave grass" (dill). Add the sliced cucumbers to one slice of bread, then put the other slice on top. Cut away the crusts and halve the sandwich down the middle to resemble tombstones. Once you have made as many as you think you'll need, get the mayo in the baggie from the fridge and nip the tip off a corner to use it as pastry bag. Write R.I.P. and the year on each sandwich half with the mayo in the pastry bag to complete the gravestones and arrange them on the large serving platter. (SERVES 20+)
Optional Step: If you have leftover nasturiums or dill, spread a little mayo on the bottom front of the sandwich and use it to glue on a little extra "funeral bouquet" or "grave grass" as decoration!
[a] Children should never be allowed to use sharp knives or mandolines! They can help with assembly on this recipe, but parents need to do all the cutting- away from small hands!