Bring a large pot of salted water to a boil. Boil the pasta according to package directions. Just before draining, reserve 1 cup of the pasta cooking water. Drain the pasta and add to a bowl with the spiralized zucchini.
In a food processor or blender, combine tahini, garlic, avocado, lemon juice, pistachios, basil, mint, jalapeno, and 1 tbsp olive oil. Blend until smooth, adding more olive oil if needed to thin.
Stir in 1/4 cup of the reserved pasta water and season the sauce with salt and pepper to taste. Pour the sauce over the hot pasta and zucchini. Toss well to combine, thinning with more pasta water if needed for desired consistency.
Heat a large skillet over medium heat and add a drizzle of olive oil. Once hot, add the Halloumi slices and cook for 1-2 minutes per side, until lightly golden and crispy. Remove from skillet and drain on paper towels.
Divide the sauced pasta and zucchini among bowls. Top generously with the fried halloumi slices.
Garnish with extra fresh basil, mint, and a sprinkle of pistachios. Serve immediately and enjoy!