In a bowl or small saucepan, whisk together pineapple juice, ketchup, vinegar, soy sauce, and brown sugar. Bring to a simmer (on stovetop or a corner of the griddle). Add cornstarch slurry and stir until thickened. Set aside.
Set your griddle to medium-high and oil the surface.
Pat chops dry and season with salt, pepper, and garlic powder. Optional: dust lightly with cornstarch for a crispier crust.
Sear on the griddle for 4–5 minutes per side (or until internal temp hits 145°F).
In the last 2 minutes, brush with sweet & sour sauce and flip once more to caramelize. Remove and let rest.
Add a bit of oil and toss on the veggies. Cook 6–8 minutes, stirring occasionally, until crisp-tender with some char. Season lightly.
Add butter or oil to a clean zone on the griddle. Toss on the cold rice and stir-fry until heated through and slightly crispy in spots (4–5 minutes). Season with salt or a splash of soy sauce if desired (I desire). Add sesame seeds if using.
Assemble and serve! I serve with extra sweet and sour sauce and pineapple chunks.