1 Cup Mayonnaise
2 Cups Grated Parmesan cheese, divided in half
1/2 Cup Chopped red onion
1 10-Oz. Package frozen spinach, thawed and chopped
3-4 Tbsp. Prepared horseradish, OR 1-2 Tbsp. chopped grated prepared horseradish (to taste)
1 Tbsp. Fresh lemon juice
Salt and pepper to taste
Stir the mayonnaise, 1 Cup of the grated Parmesan and the onions together in a medium bowl. Stir the thawed, chopped spinach into the cheese mixture. Add horseradish, lemon juice, salt and pepper. Put the mixture into a small baking dish or pie plate (7″ pie plate OR 7″x9″ oval baking dish). Sprinkle the second cup of Parmesan over the mixture. Bake at 350ºF, about 20 minutes or until the top is golden brown. If necessary, finish by broiling the dip briefly until cheese is bubbly.