Preheat the oven to 250 degrees F. Season the potatoes with salt and pepper. Place the potatoes in a small, shallow baking pan. Add the garlic, rosemary and oil. Season with salt and pepper. Cover with foil and bake until tender, about 1 hour. Remove from the oven and cool the potatoes completely in the oil. Remove the potatoes and garlic from the oil. Reserve 1/4 cup plus 2 tablespoons of the oil. In a large saute pan, over medium heat, add 2 tablespoons of the potato oil. When the oil is hot, add the pancetta. Saute for 2 minutes. Add the onions. Season with salt and pepper. Continue to saute for 2 minutes. Add the peas, confit potatoes and confit garlic. Season with salt and pepper. Continue to saute for 3 to 4 minutes or until hot. Set aside, keeping warm. Season the fish with salt and pepper. Lightly dredge the fillets in the flour. In a large saute pan, over medium heat, add 1/4 cup of the reserved oil. Pan-fry the fish for 3 to 4 minutes on each side, until the fish is golden and crispy. Remove and drain on paper towels. To serve: Spoon the potato mixture in the center of each plate. Lay the fish directly on top of the potatoes. Garnish with parsley.