Pat the salmon dry with paper towels. Season with salt and pepper and sprinkle with lime juice.
Peel the onions and garlic, chop finely and saute in the oil until softened. Transfer to a bowl and stir in the chopped dill.
Place the salmon in a steam basket and steam for about 7 minutes, or until cooked to your liking.
To serve, arrange the salmon and onions on serving plates.