They roasted the Passover animals on the fire according to the regulation, and they boiled the other holy offerings in pots, kettles, and bowls and quickly brought them to all the people.
The destruction which Josiah made of idols and idolatry was more largely related in the Kings, but just mentioned here in the foregoing chapter (v. 33); but his solemnizing the passover, which was touched upon there (Kg2 23:21), is very particularly related here. Many were the feasts of the Lord, appointed by the ceremonial law, but the passover was the chief.
Commenting on 2 Chronicles 35:1-19
And they roasted the passover with fire, according to the ordinance,.... Of the Lord by Moses, Exo 12:8. but the other holy offerings; which were the peace offerings: sod they in pots, and in cauldrons, and pans; which was forbid to be done with the passover lamb, but might with the other sacrifices, which were to be eaten, Exo 12:9.
they roasted the passover with fire according to the ordinance--(See Exo 12:7-9). This mode of preparation was prescribed by the law exclusively for the paschal lamb; the other offerings and thank offerings were cooked in pots, kettles, and pans (Sa1 2:14).