My two cents: If you ask me, the term optional may be confusing you. To me, the past perfect tense is not used as frequently as the simple past tense and if you just mean to eat, you use it. It is you who should decide whether the context of your text should give importance to difference etween time sequences or not.
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AnonymousAfter few awkward moments, she told him she had to go and left.It should be "After a few awkward moments..."
AnonymousHe rendered few criticisms during the discussion.He rendered few (few = not many) criticisms during the discussion. (Does the use of 'few' meaning 'not many' make sense?)