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Cauliflower Au Gratin with bacon and mustard greens

Cauliflower Au Gratin Casserole with Bacon and Mustard Greens

One really easy way to pre-cook veggies for any recipe is to pop them into a pot of already cooking bone broth, if you don't mind the broth tasting like the veggies. This saves you washing more dishes and time. I do it frequently and it often makes dinner prep faster and stress-free. Passive cooking time for this recipe includes steaming or poaching the cauliflower (in bone broth), cooking the bacon and baking the casserole itself.
Prep Time 25 minutes
Total Time 1 hour 55 minutes
Servings 4 servings
Author Megan


  • 1 large head cauliflower
  • 8 slices bacon, cooked until crispy (to taste) chopped into 1" pieces, sustainably-sourced, if possible
  • 1 bunch mustard greens, leaves cut from stems and stalks, reserve both
  • 1 cup grass-fed heavy cream
  • 8 ounces raw cheddar, grated or other aged cheese that melts well such as gruyere
  • 1/2 cup filtered water
  • 2 T. bacon fat, from cooking the bacon, or preferred cooking fat
  • 1 T. sustainably-sourced gelatin, such as Vital Proteins or Great Lakes brands
  • 1/2 + 1/4 tsp. sea salt divided
  • freshly ground black pepper to taste


  • Preheat oven to 400 degrees Fahrenheit.
  • Place whole cauliflower in steamer basket or in pot of simmering bone broth. Cook until tender, 30-45 minutes.
  • Carefully remove using tongs and allow to cool slightly.
  • While cauliflower is cooking, sprinkle gelatin over water in small saucepan. Allow to dissolve for 1 minute. Then heat and stir for 2-3 minutes, until foamy and steaming, but not yet simmering.
  • Remove from heat and add cream, 1/2 the cheese, 1/2 tsp. sea salt and freshly ground pepper. (Add a few sprinkles of cayenne if you enjoy it.)
  • Chop stalks of mustard greens and begin to saute them over medium heat, using the 2 T. bacon grease or preferred fat. Add a pinch of sea salt. Cook for 8 minutes. While they saute, chop mustard green leaves into bite-size pieces and add them to pan after the 8 minutes. Increase heat to medium high and add 1/4 tsp. sea salt.
  • Continue to cook until greens are wilted, about 5 minutes more. Set aside to cool slightly.
  • Cut cauliflower into flowerettes and arrange them in a 2 quart casserole dish. (No need to grease it.) Using your fingers tuck in sauteed greens under and around flowerettes. Top with bacon pieces, tucking them into remaining crevices. Pour cream mixture evenly over all. Top with remaining 4 ounces grated cheese.
  • Bake for 30 minutes. Serve in shallow bowls, ladling the extra cream alongside the cauliflower; or serve on plates if preferred, reserving the cream for another use.