I came across this sentence in Wikipedia:
Eine Tasse ist ein Trinkgefäß mit Henkel, das vorrangig für Heißgetränke verwendet wird.
Ein Henkel is a countable noun. In English, a singular countable noun usually takes an article. So it will be "with a handle". Isn't it the same in German? If so, shouldn't it be "mit einem Henkel"?
You can often leave the "einem"/"einen" aus, like in "Mit Schirm, Charme und Melone" (Instead of "Mit einem Schirm, Charme und einer Melone" - for 'Charme', it is still left out because it is not countable). When the number is obvious (Henkel is singular, so it's clear that there's only one anyway), you can leave it out without problem.
Anyway, it is always correct to say "..mit einem Henkel.."
