When Mardi Gras falls on a weekday, turn to dishes that take almost no time but are still brimming with signature New Orleans flavor. Like skewers of shrimp marinated in Cajun spices and quickly grilled, along with corn that’s then cut off the cob and tossed with a butter spiked with tasso ham. A simple rice pilaf with onion, celery, and bell pepper (Louisiana’s holy trinity) rounds out the main part of the meal, while classic bananas foster makes for a dazzling finish. Add a Sazerac, and it’s a real celebration.