Mix mayo, mustard and lemon juice until blended. Refrigerate until ready to use.
Combine cracker crumbs, 1/2 oz. Dijon mixture and chopped dill in bowl.
For each serving: Spread 1 tsp. Dijon mixture over top of 1 salmon steak. Sprinkle with 1 oz. cracker mixture.
Bake in 400°F standard oven 12 to 16 min. or until salmon flakes easily with fork and topping is crisp. Garnish with a lemon wedge and sprig of fresh dill.