Wash the potatoes and place them in a 350-degree oven to bake. Coat fillets lightly with oil and place each one on a piece of aluminum foil. (Adding a little extra oil beneath the fish doesnt hurt). Season to taste with salt and pepper and sprinkle dill on top. Top each fillet with a slice of smoked ham followed by a slice of cheese. Seal foil packets. When potatoes are just about done, place the salmon packets in the hot oven and cook for 10 to 15 minutes, until the salmon is moist, flaky, and pink but not overdone. Mix ingredients to make salsa verde (recipe follows). Remove salmon from foil packets. Serve with salsa, potatoes, and a chilled, dry white wine. Garnish with dill or cilantro and freshly sliced lemons or limes, if desired.