If he still likes the food, and you are talking about a relatively recent event, then you can use the present tense. If you are talking about a more distant historical event then use the past tense. However, the combination of modifiers "his" and "that everyone knew he liked / knows he likes" is awkward.
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samuraibabesBut could you tell me which part of it that makes it sound awkwardI explained in my first reply why it is awkward.