How many potatoes do I need for 700grams of mash?

To make 700 grams of mash, you typically need around 1 kilogram of potatoes. However, this can vary depending on the type and quality of potatoes you're using. Some varieties of potatoes hold more water than others, and some will absorb more water during the cooking process. If you're using floury potatoes, like Russet potatoes, you may need slightly less than 1 kilogram, while if you're using waxy potatoes, like Red or White potatoes, you may need a bit more. As a general rule, it's always a good idea to have a little extra potato on hand in case you need it.

So, for 700grams of mash, you'll need around 1.25 kilograms of potatoes.