Saute or grill the asparagus until slightly tender. Let cool. Wrap each stalk with a slice of fontina and the prosciutto. Serve with an aioli dipping sauce.Aioli:
Place the egg yolk, lemon juice, garlic, and salt into a food processor. Process until well blended. With the machine running, pour in the olive oil in a steady stream and process until the mixture thickens. Scrape into a bowl and squeeze a few more drops of lemon juice over the top, stir and set aside.
*RAW EGG WARNING
Food Network Kitchens suggest caution in consuming raw and lightly-cooked eggs due to the slight risk of Salmonella or other food-borne illness. To reduce this risk, we recommend you use only fresh, properly-refrigerated, clean, grade A or AA eggs with intact shells, and avoid contact between the yolks or whites and the shell.