Dear {Name},
I am so terribly sorry for serving you a dish with {ingredient}. You took such great care to tell me of your allergy before the {dinner party/potluck/etc.}. There is simply no excuse for my oversight. I am so grateful to {intervention by person/happenstance} that you did not actually end up ingesting the allergen.
I hope that you will let me make it up to you by hosting you again at {event/time}. Please believe me when I promise you that the meal will contain no {ingredient}. You are such a treasured {friend/colleague} and I would never knowingly cause you harm.
With regret,
{Name}
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Index of letter of apology templates