I only
eat half, and if I am still hungry, I
eat a side salad, with lemon juice instead of dressing. Look up the healthy food guide for fast, easy and low calorie recipes.
Another, more radical approach is: no more carbs. Eat lots of veggies, one portion of fruit only, one handful of raw nuts, low fat dairy, high fat fish, lean meat. The increase in protein will keep you from getting hungry and on the long term completely abolish any cravings.