From internet I learned that I can use soya flour and yeast with pollen. If you put over 20% pollen to mixture, it is palatable for bees.
I make dough with dough machine.
3 kg dry pollen
0,7 litre water to soften pollen over night
3 kg yeast
2 kg soya flour
1 kg heated honey (liguid)
1 kg flour sugar
If dough is too wet, add soya flour and balance the mixture with it.
Then I roll the paste between two dough paper to 5-8 mm plate and give it to the top bars of frame. During one week 2 super colony can eat 0,5-1 kg that dough. New born bees eat it very eargerly.
Near 20% pollen all colonies are not willing to eat dough.
Dough will be in condition at least 3 weeks in cold. The flour sugar add the content of sugar and stops yeast fermentation.