If you're going to do nachos for a big event, they'd better live up to the hype. And so we give you a platter of double-layered nachos that combine ground beef and black beans with heaps of tomato, cheese, scallions, olives and jalapenos. Whatever recipe or toppings you use to build your nacho platter, be sure to assemble them in layer of chips and toppings. This minimizes the number of naked tortilla chips left on the bottom of the plate. This recipe alsp includes a bath of guacamole. To save time, you could substitute purchased guacamole, or leave it out entirely and spoon salsa over the finished nachos.