Heat at least 2 inches of water in a deep skillet to a gentle simmer. Add spinach and blanche for 2 to 3 minutes. Remove with a slotted spoon, drain and set aside. Add vinegar to water (to hold the eggs together). Drop eggs into simmering water. Toast English muffins. Simmer eggs 3 to 4 minutes for soft yolks. Place the English muffins on a plate and top with spinach. Place poached eggs on spinach and lightly sprinkle with salt and pepper. Top with cheese. Serves 1. Recipe is easily multiplied.