Mushroom Pimiento Salad

Ingredients

• 1 pound fresh mushrooms, quartered
• 2 cups sliced celery
• 2 jars (2 ounces each) diced pimientos, drained
• 3 hard-boiled large egg whites, chopped
• 3 tablespoons sliced green onions
• 3/4 cup vegetable oil
• 1/4 cup red wine vinegar
• 1/4 cup sugar
• 1 garlic clove, minced
• 1 teaspoon celery seed
• 1/2 teaspoon salt
• 1/4 teaspoon pepper
• 1/4 teaspoon dried marjoram
• Lettuce leaves