"They have salt, oil, and tea."
Translation:De har salt, olie, og te.
"har" is the present tense form of the infinitive (basic, not inflected) "have".
In English, for most nouns there are two present tense forms. One that is identical to the infinitive for plural subjects and first and second person subjects (We/You/I/They have), and one that adds an "-s" added for third person singular objects (He/she/it has).
Danish however always adds an "-r" in their present tense no matter what the subject is, other than for irregular verbs of course such as "have", but the present tense form is always the same. (Vi/Du/I/Det/Hun/Han har)
I hope that hasn't confused you even more.