I cook the hoppers in an aluminium Balti pan and use a lid from a SS saucepan. I tried the small SS Balti pans but it didn't work.. You can buy proper Hopper Pans with lid but I don't have one. I used the recipe from the link Phil provided above but it was a bit thin so I added some plain flour and allowed it to sit overnight. I then recooked some after 4 days of the batter being in the fridge. Still fine.