Marinated Citrus Salad

Ingredients

• 1-1/2 cups orange juice
• 1/2 cup red wine vinegar
• 1/4 cup orange marmalade
• 1/4 cup sugar
• 1/2 teaspoon pepper
• 1/4 teaspoon salt
• 3 medium grapefruit, peeled and sectioned
• 3 medium navel oranges, peeled and sectioned
• 32 fresh asparagus, trimmed
• 1 medium cucumber, thinly sliced
• 1 medium onion, sliced and separated into rings
• 1 medium ripe avocado, peeled and cubed
• 6 cups torn romaine
• 6 cups torn red leaf lettuce
• 1 teaspoon minced fresh mint, optional