Combine the wine, garlic, oregano, salt, pepper, bay leaves, and cumin in a nonporous glass dish or bowl.
Mix together.
Add pork and toss to coat. Cover dish or bowl and refrigerate to marinate for 2 to 3 hours.
Heat oil in a large skillet over medium heat.
Add onion and saute until soft.
Remove pork from dish or bowl (reserving marinade) and add to skillet; brown quickly, then add potato cubes, reserved marinade, beans, cayenne pepper and clams or mussels. Cook until open, about 7 minutes.