Run potatoes through a food mill and into a bowl.
Pass them through the medium blade of a food mill.
Pass through a food mill as above and return to the dish.
Press the mixture through the fine disc of a food mill.
Put the vegetables and fish through a food mill with the fine grill in place.
Pass the mixture through a food mill and place in a clean pan.
Pass the tomatoes through a food mill and set aside.
But after two attempts I gave up and dug out the food mill.
Push the potatoes through the food mill into a bowl.
Even a simple manual food mill, which needs no electricity, can be used.