What kind of chestnuts can be roasted?

The most commonly roasted chestnuts are European sweet chestnuts (Castanea sativa) and Chinese chestnuts (Castanea mollissima), both known for their sweet flavor and tender texture when cooked. American chestnuts (Castanea dentata) were once popular but are now rare due to blight. It's important to note that horse chestnuts (Aesculus species) are not edible and should not be roasted or consumed.