On Saturday, April 20, Riverhead’s Tanger Outlets will host A Taste of the East End, featuring the edible Food Truck Derby. Edible East End invites you check out the food trucks from New York City and Long Island as well as local beverage producers, who will be there to tempt your palate with a variety of local libations. Morris Grilled Cheese, the only Slow Food-certified food truck in New York, will have a wide array of the obvious — including gluten-free options — with all the fixings. Korilla BBQ will be serving up Korean BBQ with organic veggies (yes, they have…