Begin by preparing the pesto sauce. Add all ingredients for the pesto except for the avocado oil to a food processor. Pulse to chop. Leave the food processor on and stream the avocado oil through the top until it is incorporated. Refrigerate until ready to use.
Prepare the pasta noodles according to package instructions. While the pasta is cooking, slice up the chicken sausage and cook it in a skillet. To do so, heat 1 to 2 tablespoons of avocado oil to a skillet and heat to medium-high. Place the slices of sausage on the hot skillet and cook until seared, about 2 minutes. Flip and continue cooking another 2 to 3 minutes.
Drain the pasta, then transfer it back into the pot you used to cook it. Add the cooked sausage and pesto sauce and stir well (but carefully!) to combine. Taste pasta for flavor and add more sea salt and/or lemon juice to taste.
