HEAT oven to 400°F.
MIX mayo, mustard and dill until well blended. Place fish in shallow ovenproof dish; drizzle with lemon juice. Cover with mayo mixture and cracker crumbs.
BAKE 12 to 14 min. or until fish flakes easily with fork. Meanwhile, cook pasta in large saucepan as directed on package, omitting salt and adding broccoli to the boiling water for the last 2 min.
DRAIN pasta mixture in colander, reserving 2 Tbsp. of the pasta cooking water. Heat oil in same saucepan on medium heat. Add garlic; cook and stir 1 min. Add pasta mixture and reserved cooking water; toss to coat. Top with cheese. Serve with fish.
