In a skillet, toast the coriander seeds over moderate heat until fragrant, about 2 minutes. Transfer to a food processor and pulse until chopped. In the skillet, toast the unsweetened shredded coconut and cumin seeds, stirring, until the coconut is golden, 2 minutes; add to the food processor along with the chopped nuts and pulse until coarsely ground. Transfer the dukka to a bowl. In the skillet, toast the sesame seeds until golden, 4 minutes. Stir the sesame seeds into the dukka, season with the salt and pepper and serve.