Start the water for the orzo heating in a large pot (we're multi tasking here to make this a quick meal!). When it comes to a boil, add a tablespoon of salt and cook the orzo one minute less than the package directions. Add the spinach to the pot and cook until wilted, about a minute or so. Drain the pasta and spinach together in a colander.
While the pasta cooks, heat the oil in a large 12-inch nonstick or stainless skillet over medium heat. Add the pork or chicken, sprinkle with the salt and pepper, and cook until golden on the outside (it will finish cooking in the next step). Add the bell peppers, tomatoes, oregano and garlic, and cook, stirring often, until the tomatoes burst and the meat is cooked through, 5-7 minutes.
