In a large skillet (I used nonstick) on medium heat, add the olive oil and then the onion. Cook the onions until they begin to soften (4 to 5 minutes), then add the pears along with the honey, mustard, vinegar, salt and pepper. Turn heat to low and let simmer for about 5 minutes. Add a splash of water if the pan becomes too dehydrated. Set aside to cool a bit.