Place the mixed nuts and dried fruit in a blender or food processor. Pulse until finely chopped.
Transfer to a bowl and mix with the cinnamon powder.
Add either the maple syrup OR the butter and brown sugar mixture. Stir until the filling comes together.
Remove the frozen roti from the freezer. Peel away the top layer of plastic but leave the roti resting on the bottom layer. This makes it easier to handle as it softens.
Spoon 1/4 of the filling into the centre of each roti.
Fold the edges towards the middle, overlapping them to form a sealed parcel.
Melt a little butter in a frying pan over medium heat.
Place the parcel folded-side down in the pan.
Scatter sesame seeds over the exposed surface while the dough is still uncooked so the seeds adhere properly.
Cook until the bottom is golden brown and crisp, about 2–3 minutes.
Carefully flip and cook the sesame seed side until golden and crisp. Add more butter if needed.