Nippy Tuna Casserole

Ingredients

• 1/4 c. chopped green pepper
• 3 Tbsp. margarine
• 2 Tbsp. flour
• 1 c. milk
• 1 Tbsp. grated onion
• 2 tsp. prepared mustard
• 1 tsp. horseradish
• 1 tsp. lemon juice
• 1/4 tsp. salt
• 1/4 tsp. pepper
• 1 (17 oz.) can whole kernel corn, drained
• 2 hard-cooked eggs, sliced
• 1 (7 oz.) can tuna, drained and flaked
• 1 c. shredded Cheddar cheese, divided