Main Dishes: Vegetarian         Baby Bok Choy ERIC RIPERT of Le Bernardin           Bubble and Squeak APRIL BLOOMFIELD of the Spotted Pig           Cavatelli With Oven-Roasted Eggplant, Tomatoes, Basil, and Ricotta Salata LIDIA BASTIANICH of Felidia and Becco           Celeriac Pur�e ERIC RIPERT of Le Bernardin         Dad's Macaroni and Cheese DAVID PAGE of Home         Grilled Stuffed Portobello Mushrooms VINCENT SCOTTO of Scopa         Stir-Fried Mixed Vegetables CHARLIE PALMER of Aureole         Zucchini-and-Green-Zebra-Tomato Lasagne with Basil-Pistachio Pesto MATTHEW KENNEY of Pure Food and Wine         Green-Curry Coconut Noodles with Spring Vegetables MATTHEW KENNEY of Pure Food and Wine