This is how fishermen prepare fresh catches in the camp, with the smoke of the fire, in a cauldron, adding mayonnaise or sour cream. I have an excellent alternative - homemade yogurt, which I am 100% sure of. I made it myself from fresh milk, with sourdough from Orsik, in a thermos yogurt machine. By the way, the thermos does not require any special conditions, so it can safely be used for multi-day trips to the countryside, especially with children, and fishing - for a long fishing trip. Keep it in mind, but in the meantime, help yourselves.