Learn Hardcore Swahili: Kama ungekuja mapema, ungeonja siagi hiyo tamu na asali safi. - If you had come early, you would have tasted that sweet butter and pure honey.

u- is the subject prefix for you (singular). -nge- is the conditional (irrealis) marker. When you attach them to kuja (to come), u- + -nge- + kuja gives you would come.

What tense or mood is used in ungekuja and ungeonja?

Both verbs are in the past-subjunctive (also called irreversible or conditional) mood, used to describe unreal or counterfactual situations—you would have come and you would have tasted.

Why is -nge- repeated in both ungekuja and ungeonja?

In Swahili conditionals, the irrealis/conditional marker -nge- appears in both the “if” clause and the main clause to link the hypothetical action with its result.

What do siagi hiyo tamu and asali safi mean?

siagi = butter, hiyo = that, tamu = delicious → siagi hiyo tamu means that delicious butter.
asali = honey, safi = pure → asali safi means pure honey.

Why do adjectives like tamu and safi come after the nouns?

Swahili syntax places adjectives after the noun they modify, unlike English where adjectives usually precede the noun.

What is na used for here?

Na is a conjunction meaning and, linking two noun phrases.

What does mapema mean, and does it change form?

Mapema means early. It’s an adverb and does not change for number or gender.

How would you express a real (likely) condition instead of a counterfactual one?

Use the simple present/future:
Kama utakuja mapema, utaonja siagi hiyo tamu na asali safi.
= If you come early, you will taste that delicious butter and pure honey.