A finely minced jalapeño pepper can replace the red curry paste. Mince the jalapeño pepper with the seeds if you want a spicy sausage.
Ground fennel seed can be subsituted for the ground anise seed.
Any soy sauce substitute can be used: liquid aminos or tamari.
We have omitted kosher salt in this recipe since fish sauce and soy sauce tend to be on the salty side. Season with kosher salt to taste if you choose to.