Bring wine and water to a simmer in a large skillet or wok. Meanwhile, line the top of a small steamer basket with 2 lettuce leaves. Season both sides of salmon with salt and pepper and place on top of lettuce, then place a dill sprig over fish. Place remaining 3 lettuce leaves in the bottom basket and top with cabbage "cup." Place peas in the cup. Dot peas evenly with butter and top with remaining dill sprig; season with salt and pepper.
When the liquid in the skillet is boiling, set the basket with peas in the skillet, rest the salmon basket on top, then secure the bamboo lid tightly in place. Steam until peas are just tender and bright green and fish is evenly opaque throughout, 7 to 9 minutes (you’ll have to remove the top basket to check). You may need to add more water to the skillet.
Whisk together yogurt, lemon juice, and salt and pepper to taste. Serve salmon, cabbage, and peas immediately, with yogurt sauce on the side.