Chop the onion, mince the garlic, slice the jalapeño, and shred the turkey. Measure the sauces and seasonings and set them near the stove. Fried rice cooks so fast that you won't have time to hunt for ingredients halfway through.
Heat the oil in a large wok or skillet over medium-high heat for about two minutes. Add the onion and garlic and cook for another two minutes, until fragrant. Toss in the jalapeño now if you are using it.
Add the turkey and stir for about a minute to warm it through. Push it to one side of the pan and pour the eggs into the empty space. Scramble them gently until just cooked but still tender, then mix everything together.
Add the cooked rice, then the soy sauce, sesame oil, stock powder, white pepper, salt, and black pepper. Stir for about two minutes so every grain gets coated. If the rice feels firm, add up to 1/4 cup of water to soften it.
Add the frozen carrots and peas and stir-fry for about two minutes, until heated through. Stir in the green onions at the very end. Serve hot with sesame seeds sprinkled on top.