NEW YORK - Making cannoli is serious business in New York. It's a dessert so tempting that even a hit man in the “Godfather” couldn't leave a box behind.

But even the most respected chefs of this and other pastries are being ordered to make changes by Tuesday - the day New York's trans fat ban takes full effect.

New York is the first American city to adopt such a stringent rule.

Starting this week, the ban extends to almost all prepared food in restaurants, bakeries, cafeterias, salad bars and food carts. There will be a three-month grace period before big fines are slapped on violators. The artery-clogging substance was first banned from cooking oils last year.

Chefs who relied on trans fats to make their pie crusts flaky, their crackers crispy and their muffins moist have worked overtime finding substitute ingredients.

They have burned through hundreds of gallons of oil, shortening and margarine trying to retool old recipes without damaging flavor, texture or color.

Yet, with the deadline looming, it appears that few, if any foods, are getting whacked.

Fast food giants from McDonald's to Taco Bell say they have banished trans fats without having to drop a single item from their menu.

Baking supply companies have introduced a host of replacements for the partially hydrogenated vegetable oils that are the biggest source of trans fats. Not even Crisco is made of Crisco anymore. The company reformulated all of its products last year to have “zero grams of trans fat per serving.”