The business cards at Horizons read “New Vegan Cuisine,” an accurate description of how owners Rich Landau and Kate Jacoby think about vegan eating: It’s not a denial diet, but a full-fledged cuisine, complete with its own wines and beers. Within the no-animal-product strictures, the couple turn out colorful dishes like grass-green edamame hummus, black peppercorn-topped portabella carpaccio, and hearts-of-palm paella.