In a saute pan, heat the olive oil. When the oil is hot, saute the onions for 3 to 4 minutes, or until lightly caramelized. Add the apples, garlic, salt and pepper and continue sauteing for 1 minute. Stir in the Calvados and stock. Bring the liquid up to a boil and reduce to a simmer. Cook the mixture for 20 minutes. Adjust the seasonings if needed. Slice the pork roulade into 1 1/2-inch slices. Mound the potatoes in the center of the platter. Arrange the roulades pieces around the potatoes. Spoon the garlic reduction over the roulades. Place a tablespoon of the applesauce on top of each roulade. Pile the fried parsnips in the center of the potatoes. Garnish with the chives.