Here in the Philipines, the common Pork Liempo Recipe is made with a marinade of soy sauce, pepper, sprite or 7-up and Philippine Lime (Kalamansi) and it is then grilled over charcoal but other versions include putting it in the oven with other marinades like Tomato sauce, brown sugar and orange juice which is less rustic than the first one.
This video shows another recipe for pork liempo.