Roseau market still sells cocoa in sticks you grate into a pot with spices. That is a snack-breakfast, bitter-chocolate and bay leaf, not a Swiss tablet. Farine, toasted cassava, comes from Kalinago producers on the east coast; eat it dry or with a bit of fish. Coconut drops and sugar cake fill the sweet bags that look familiar from neighboring islands.
Dominica is not a rum-cake airport in the same way as some neighbors. Pack cocoa sticks and farine. Fresh coconut sweets are sticky in the rainforest humidity. Keep the page off a Barbados copy-paste: cocoa sticks and cassava farine are the Dominican tell.