Grape and Walnut Salad Cups

Ingredients

• 2 cups red or green grapes
• 1 cup walnuts
• 1 Lebanese cucumber
• 1 bunch chives, finely chopped
• 2 tablespoons extra virgin olive oil
• 1 tablespoon sherry or white wine vinegar
• 1 teaspoon seeded mustard
• 6 iceberg lettuce cups