I wonder how to say "please accept this (offering)" in Japanese?
It's when u gift somebody dear to u some flowers or foodstuff and do it from the bottom of ur heart.

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Answer

when you you give somebody gift,you can say:ki ni itte moraeba ureshii desu.(気に入ってもらえばうれしいです)means i hope you like it.if the gift is food you can say:o kuchi ni aeba saiwai desu.(お口に合えば幸いです／お口に合えばうれしいです).means i hope you like the teast. saiwai is the polite expression of ureshii.