In a medium mixing bowl, toss the pineapple, red onion, jalapeño, cilantro, lime juice, and salt until well combined. Chill in the refrigerator.
In a large liquid measuring cup or mixing bowl, whisk together the pineapple juice, brown sugar, soy sauce, water, vinegar, sesame oil, sriracha, and cornstarch. Set aside.
In a large skillet, toss the avocado oil, chicken, paprika, ginger, garlic, and salt.
Arrange the chicken in an even layer and turn the heat to medium high. Sear both sides and sauté until almost cooked through.
Turn the heat to medium. Deglaze the pan with the sauce, scraping any bits off the bottom.
Simmer until the sauce has thickened and is glossy.
Assemble the tacos with the chicken and pineapple salsa.