Have just done these based on a recent Yotam Ottolenghi recipe (although, as usual, it has been altered a bit). They were very nice and I will be adding this to the list of Quiet Waters Merguez keepers.
Fatty lamb/goat or mutton (minced) 1000g
Two medium Red onions (finely chopped)
Zest of five preserved lemons 50g
4 tsp Sweet Paprika
1 ½ tsp Sweet Smoked Paprika
1 ½ tsp Cayenne pepper
4 tsp crushed ancho/chipotle pepper flakes
9 cloves crushed garlic
4 tsp toasted whole cumin seed
3 tsp toasted whole fennel seed
1 tsp caster sugar
2 2.5 tsp fine sea salt
soften onions in a drop of olive oil, then let cool.
mix meat, spices, sugar, salt, lemon and onion mix until sticky.
stuff in sheep casings.