Combine onions and vinegar in bowl and marinate for 5 minutes. Drain the onions and set aside. Spray a large skillet with non-stick cooking spray, and heat over medium heat. Add onions, and cook until onions have softened, about 5-7 min. Transfer to bowl and set aside. Place tortillas in a large nonstick skillet over medium heat (they will overlap). Warm for about 45 seconds on each side.
Here’s the full shopping list for exactly what to buy, and check to make sure you have a few pantry staples on hand. Morris recommends starting on a weekend, so you can make a big pot of veggie soup, and give your body a chance to adjust before diving into a busy week. Her plan cuts carbs for the first couple of days, before slowly reintroducing whole grains. And if you want to mix it up, there are lots more options for healthy snacks, just make sure to get a serving of fruit or vegetables, along with protein.