Ketchup was originally a Chinese Fish Brine Sauce in the 17th century. The British encountered it in Malaysia, and made a mushroom-based sauce out of it in the 18th century. In the 19th century, it became tomato based, and finally by 1850 it dropped anchovies as an ingredient and all semblance of its original fish-based existence was lost.
The same person who puts it on a pizza.
Butter can also be white based on the milk/cream it is made from. My shop buys a lot of farm fresh milk for ice cream. We use some of the cream to make butter. for a while, it was completely white because the cows only got hay but we recently had good rain and now that they got fresh grass the butter is yellow.