Spinach Salad

Ingredients

• 1 small head lettuce
• 1/2 (10 oz.) pkg. frozen spinach or 5 oz. bulk fresh spinach, washed thoroughly and tough stems removed
• 1 large purple onion, cut into rings
• 1/2 (10 oz.) pkg. frozen green peas, thawed
• 4 hard-cooked eggs, chopped
• 1/2 lb. bacon, fried crisp, drained and crumbled
• 1 (5 3/4 oz.) can water chestnuts, chopped
• 1/2 tsp. sugar
• 1/2 tsp. salt
• 1/8 tsp. pepper
• 1 c. mayonnaise
• 1 c. salad dressing
• 6 oz. grated Swiss cheese
• parsley sprigs (for garnish)