To make the cauliflower salad, bring 1 inch of water to a boil in a large saucepan fitted with a steamer basket. Add cauliflower, cover and steam until just tender, 4 to 6 minutes.Whisk mayo, 1 tsp lemon juice, 1/2 tsp dion mustard, hot sauce, turmeric and 1/4 tsp salt in a medium bowl.Add the cauliflower to the bowl and coarsely mash with a potato masher or fork. Stir in celery, onion and dill.