Add the olive oil to the same pan used for frying the potatoes. Add the onion and bell pepper and sauté for 2 to 3 minutes. Add the garlic and sauté for 20 to 30 seconds. Mix in the ground beef, bay leaf, tomato sauce, wine, oregano, cumin, sugar, salt, paprika, and black pepper. and stir. Cook over medium-low heat for about 15 to 20 minutes, stirring occasionally. Add more water, if the mixture becomes too thick.