'If you like ketchup and you also like ice cream, then you would surely like ketchup ice cream.' Which fallacy is committed in this argument?

The ketchup-ice-cream argument commits the fallacy of composition.

Liking ketchup and liking ice cream are properties of the two items separately.

The argument transfers this liking to their combination taken as one dish.

What holds of the parts individually need not hold of them joined together.

Inferring the whole's quality from its parts is the fallacy of composition.