For the chicken: Preheat the oven to 450 degrees F.
Put the chicken, garlic, potatoes, lemon, onion, oil, herb and spice mix in a large bowl and toss thoroughly to coat everything.
Spread the mixture on a sheet tray and cook until the chicken is cooked through to 160 degrees F, about 30 minutes. Cook pork to 150 degrees F and beef to desired doneness, 125 degrees F for medium rare.
For the rice pilaf: Meanwhile, heat a small saucepan over medium heat. Add the rice and oil and toast the rice for 1 minute. Add the onion and cook, stirring, 1 minute more. Add the stock or water and a pinch of salt and bring to a simmer. Cover and simmer until the liquid is absorbed, about 18 minutes. Shut off the heat and let the pilaf sit for a couple of minutes. Fluff with a fork and serve with the chicken and vegetables.
For more ingredient substitution ideas, see the article below.