Three Lettuce Salad

Ingredients

• 2 heads bibb lettuce (about 1/4 lb.)
• 1 head Boston lettuce (about 1/2 lb.)
• 1 head red leaf lettuce (about 1/4 lb.)
• 2 tsp. Dijon mustard
• 3 Tbsp. red wine vinegar
• 1/4 c. olive oil
• 1/4 c. fresh parsley
• salt and freshly ground pepper to taste