[header] How to roast chestnuts in an oven [title] Pre-heat your oven to 350 ° f (177 ° c). [title] Choose your chestnuts. [step] Start with firm, shiny chestnuts. 
Discard chestnuts with cracks or holes in the shell. [substeps] It's not too uncommon to see white " worms " (larvae) inside some of the chestnuts.