Step 1

Divide the grated cheese between 6 cups or bowls.

Step 2

Add the food coloring to the bowls, designating a specific color for each. (Depending on your food coloring, you may need to make your own green and purple colors).

Step 3

Gently stir or toss the cheese to thoroughly coat in the food coloring. Set aside to saturate for 10 minutes (this will help deepen the color).

Step 4

Meanwhile, spread butter over one side of each of the bread slices.

Step 5

Fill the un-buttered side of 4 slices of bread with stripes of the colored cheese, creating a rainbow look.

Step 6

Cap the sandwiches with the remaining bread slices, buttered side-up.

Step 7

Preheat a large skillet or griddle over medium heat.

Step 8

Once hot (and working in batches if necessary), add the sandwiches to the skillet, and toast for 3 minutes per side or until golden and melty.

Step 9

Remove from the skillet, slice in half on a diagonal, and serve.