18 hours ago, Jayycl said:Haha good one mate. It is as salty as it gets. Sea salt. Not one bit bitter.
Actually, that's a possibility.
Sea salt, by its nature, has random and variable impurities in it. It might be worth having another go, using a generic pure salt (ie pickling or kosher salt, not iodized table salt), just to see.
Edited to add, for clarity, that an impurity in the salt might be reacting with something in the tomatoes to create the bitterness.