Grapefruit, Mustard Green, and Date Salad

Ingredients

• 1 tablespoon finely chopped shallot
• 1 tablespoon fresh lime juice
• 1 1/2 tablespoons olive oil
• 1/4 teaspoon sugar
• 1/4 teaspoon salt
• 1 small pink or red grapefruit
• 1/4 lb young mustard greens, trimmed and cut into 1/2-inch pieces (2 cups)
• 1/4 cup dried dates, pitted and chopped
• For garnish: pomegranate seeds