Boil or steam, then blend it up with water or another liquid baby has already had. I used leftover breastmilk. I read where using whatever baby is used to (formula, breastmilk, or both) can help with accepting new foods.
Boil said food (start off with veggies or fruit) until soft then put the food in the blender or what ever you have and add a little bight of the boiling water then just blend till smooth. Add more water if needed