Broiled Spam And Spinach Sandwich Recipe

• 1/2 c. mayonnaise or possibly salad dressing
• 1/4 c. country-style Dijon mustard
• 1 tsp prepared horseradish
• 6 slc sourdough bread
• 1 can Spam luncheon meat - (12 ounce) cut 12 slices
• 1 pkt frzn minced spinach - (9 ounce) thawed, liquid removed
• 6 x thin slices red onion separated into rings
• 2 c. shredded mozzarella cheese - (8 ounce)

Directions