Preparation
1. Boil 1L of water,once water is boiling put the chicken inside
2. Cut onion into 3/4 inch wedges
3. Chop 1/2 lettuce
4. Peel and chop avocado in slices
5. Shred chicken in thin pieces
6. Spread a large spoon of beans to the tostada
7. Put the chicken and lettuce on top of the tostada
8. Place the avocado, onion and tomatoe slices on top
9. Pour sour cream
10. Sprinkle on cheese
11. Finally add salt, lime and salsa at choice