Depends on the coffee I'm drinking, if it's very strong I like some sugar in there else nothing...... or strong, no sugar while also having good chocolate.
I don't use sugar. I make my coffee in vietnamese style with condensed milk. Usually about 1-2 spoon of condensed milk. It taste better than sugar in my opinion.
I add 1 spoon of sugar on my Coffee. But I know a friend in Panama that adds 4 spoon of sugar. When I taste the coffee I drink water immediately because it's very sweet. He said that he really like the sweetness in coffee. - Gustavo Woltmann
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Coffee is simply increase initial energy power. Many people mixed various things for testy. Sugar is best on of them. Without sugar a coffee is tasteless. 2/3 tablespoon sugar is the best for generally using the coffee. But for more tasty someone mixed 4/5 table spoon sugar.