ציטירנדיקער פּירוש אויף דברי הימים ב 35:12

ובשלת ואכלת, “you are to boil it and eat it.” The word ובשלת in this connection means “to barbecue it on a spit over an open fire” as we know already from Exodus 12,8. The word בשל occurs in the sense of “ripening, becoming ready for its destiny,” already in Genesis 40,7 when the butler described his dream with the grapes. Similarly, the meaning of Chronicles II 35,13 ויבשלו את הפסח, does not mean that the people boiled the Passover in water, but that they made it ready for eating.