slow, sloe

Slow or slow describes a person or thing taking more than the usual amount of time for an action or function--
What time is it? My watch is slow.
Pay attention. There's a "SLOW" sign up ahead.

Sloe or sloe ( rhymes with slow ) means a currant--a kind of a berry used in cakes and liqueurs--
Sloe gin is made with blackcurrants.
Sloe-eyed means having dark eyes, especially where that is not common.

Now that you know that, you can say--
"The recipe for sloe preserves calls for very slow cooking."

Note--"slowly" is an adverb--it describes a verb, or an action--
Must you walk so slowly? We'll never get there.
The boat glided slowly over the water.