Hartvig K. Sverdrup made caviar the old-fashioned way, this is adapted to make at home without smoking.
2 kg scraped roe and 4 tablespoons salt - put in the fridge overnight.
The next day is added:
2-3 tablespoons smoke acid
2 tbsp salt
2 tablespoons sugar
Season with pepper
Add soybean oil as needed.
This can easily be made at home, good luck!