I would give you my soul in a blackberry pie, illustrating a deep and passionate willingness to sacrifice everything for someone. The speaker’s devotion is so intense that they are willing to entrust their very essence, symbolized by their soul, in a humble and comforting form like a blackberry pie, showing how love or attachment can be all-consuming and selfless.

This quote also humorously acknowledges the absurdity of such devotion, as the speaker humorously adds a knife to cut the pie, hinting at the potential danger or pain involved in giving away one's complete self. It reflects both the sweetness of love and the possible hardship or loss that comes with such intense feelings.