Prepare the slaw by mixing together all of the ingredients, set aside.
Heat a large skillet over medium-high heat with two tablespoons olive oil. Add the onion to the pan and saute about 5 minutes until soft. Slice the sausages into rounds and add to the pan in a single layer. Let brown 1- minutes per side.
Add the apple and potato to the skillet and toss with the onion and sausage. Pour in 1/4 cup of water and cover letting the potato cook for about 10 minutes. Remove the lid and stir every few minutes. Season with salt to your taste.
Divide the mixture between 12 tortillas and top with slaw and sliced jalapeños.