Add some CMC to 18 g of brown sugarpaste. Keep on adding it gradually until you feel that the paste is starting to thicken. Roll a ball. Flatten it slightly. Keep on pressing it to the board and rotating it to create a dome. Hold your fingers close to the board - that way you will sharpen the bottom edge. Smooth the sides and the top surface.
The seed needs to be slightly smaller (1-2 mm smaller) than the diameter of the cut out circle, so that it fits in nicely.