For the sauce: Heat 1/2 pound (2 sticks) of the butter in a saucepan until the milk solids turn a light brown. Add the yeast. Cook until yeast is caramelized and the same color as the butter. Add tamari and grape juice or red wine, then pour contents into a blender and blend until smooth. Pour back into pot and add remaining 1 stick butter. Whisk until emulsified. Reduce until saucy consistency.
For the cauliflower puree: In a Dutch oven or table-top fryer, preheat canola oil to 350 degrees F. Remove leaves and stem from cauliflower. Quarter the head of cauliflower. Fry until brown. Transfer to a blender in batches and blend until completely smooth. Season with salt.
For the scallops: Push 3 pieces of frozen matchstick bacon into each raw scallop through the top.
Add the canola oil to a medium saute pan over high heat. Once hot, sear scallops on one side until caramelized, 2 minutes; flip and cook the second side until caramelized, 2 mintues. Remove from heat.
For the garnish: In a small saute pan over a low flame, add the bacon lardons and 1 teaspoon olive oil and cook until the bacon renders its fat and becomes crispy, about 10 minutes.
Place frisee in a mixing bowl and dress lightly with sherry vinegar, 1 teaspoon olive oil and about 1 teaspoon of warm bacon fat.
To serve: Spread cauliflower puree on a serving platter. Slice scallops in half widthwise, then arrange over the cauliflower puree, garnish with the dressed frisee, spoon yeast sauce over the top and finish with some crispy bacon lardons.