Memorial Day marks the unofficial beginning of summer and the official beginning of grilling season. From northern Maine to southern California, the backyard barbeque will be a key part of the holiday weekend. Whether your menu includes simple burgers or something more elaborate, several simple steps can help you serve up a healthy meal: Start with a clean grill. Limit the formation of potential cancer-causing compounds by marinating meat, poultry, or seafood before cooking, cooking for longer at a lower temperature, and having a spray bottle filled with water handy to control fatty flare-ups. Give veggies and fruit equal billing with meat. And practice safe grilling by keeping raw meat, poultry, and seafood separate from vegetables and other foods, using a food thermometer to check the internal temperature of grilled meat, poultry, and seafood, and placing grilled food on a clean plate, not on the ones that held them when they were raw.