1. Roasted sweet potato and chestnuts
Sold side-by-side at mobile street carts (usually found close to popular MTR exits), roasted sweet potatoes and charcoal-cooked chestnuts are popular treats that start to emerge come wintertime. There are only a few street vendors left in Hong Kong that still peddle these delicious wares and they're identifiable by the distinct aroma they give off and the cloud of smoke that surrounds them. Most of these vendors also sell salt-baked quail eggs. Be sure to grab a bag if you see it.