Method 1
1. Buy fish (5 gold each)
2. Buy salt (4 gold each)
3. Cook fish
4. Sell it for 10 gold each
It gives you 1 gold per fish so dont forget to use x5 and x10 multipliers.
Method 2
1. Buy 3 eggs (6 gold)
2. Cook eggs
3. Sell for 7 gold
It gives you the same profit as Method , but it becomes available a little bit earlier.
Enjoy your endless money :)
Source: https://steamcommunity.com/sharedfiles/filedetails/?id=2660494255