Preheat oven to 350 degrees.
For the glaze: In a small saucepot add canola oil and saute onions and garlic until translucent. Then add chipotle and arbol chilies and continue to cook until chiles start to toast. Then add cracked black pepper and deglaze with Worcestershire sauce and orange juice. Reduce orange juice until starts to thicken. Then add in your favorite barbecue sauce and reduce to low heat. Continue cooking for about 15 minutes. Season with hot sauce, lemon juice and to taste with salt. Strain barbecue sauce and set aside.
For the porkloin: On a large sheet pan rub the porkloin with olive oil and season with salt and cracked pepper. Roast in a 350 degree oven (basting with the citrus glaze about every 15 minutes) until the internal temperature is about 140 degrees. Let meat set up for about 5 minutes and slice.
Recipe courtesy of The Brothers Rathbun, Kevin Rathbun, Nava Restaurant, Atlanta, GA, and Kent Rathbun, Abacus Restaurant, Dallas, TX