Bring a pot of salted water to a boil and cook the cauliflower florets for about 5-7 minutes until tender. Remove from the pan with a slotted spoon and keep the water boiling on the stove. You will need it to blanch the spinach later on.
Transfer the cauliflower to a blender or food processor and process with 2 tablespoons of butter and half the minced garlic to make a puree. Set aside in the blender to keep warm.
Blanch the spinach leaves in the reserved water for 10-20 seconds until wilted and set aside.
Make sure the scallops are dry by patting them with paper towels. Season with a little bit of salt and freshly ground black pepper.
Heat the remaining butter in a cast iron skillet or large frying pan over medium-high heat. Add the scallops to the pan, leaving space in between, and sear them for 2 minutes without turning them.
Flip the scallops over and add the remaining garlic to the pan. Cook for a further 60 seconds while spooning over the garlic butter until both sides are golden brown.
Make a bed of cauliflower puree on your serving plates, add a layer of spinach, and top with the scallops. Serve hot.