Spinach, Grapefruit and Avocado Salad with Proscuitto

Ingredients

• 1/4 cup granulated sugar
• 1/2 teaspoon dry mustard
• 1/2 teaspoon sweet paprika
• 1/2 teaspoon celery seed
• 1/8 teaspoon salt, or to taste
• 3 tablespoons honey
• 3 tablespoons red wine vinegar
• 1 tablespoon freshly squeezed lime juice (about 1/2 medium lime)
• 1/2 cup canola or grapeseed oil
• 4 cups loosely packed baby spinach leaves
• 1 medium pink grapefruit
• 1 medium ripe avocado
• 4 prosciutto about 4 slices, very thinly sliced