Put the couscous in a bowl and mix well with 2 tbsp of the olive oil and a tsp of salt. Pour over the boiling water and cover with cling film. Leave in a warm place for 1 hour.
Towards the end of this time, heat the remaining olive oil and sauté the shallots until very soft. Add to the couscous and mix well. Toast the pistachios in a dry pan, then grind into large