Add all dressing ingredients - cashews, pumpkin seeds, lemon juice, water, garlic, nutritional yeast, tamari, apple cider vinegar, olive oil, white pepper, salt, and nori - to a high-speed blender.
Blend until smooth and creamy. Taste and adjust seasoning if needed. Set aside.
Start with portions of sea bass or halibut, skin on if possible. Chop into chunks or leave whole, depending on your preference.
Season generously with blackening spice - I use a store-bought blend (you can find it just about anywhere).
Heat a little oil in a skillet over medium-high heat. Sear the fish on both sides until golden and cooked through, about 3–4 minutes per side.
Finish with a drizzle of fresh lemon juice and set aside.
Add chopped kale to a large bowl and pour over your vegan Caesar dressing. Use your hands to massage the dressing into the kale for 1–2 minutes until it softens and darkens in color.
If you're keeping it dairy, go ahead and top with some freshly grated Parmesan.
Spoon the creamy kale salad onto a plate. Arrange the cooked blackened fish on top and sprinkle with more cheese if desired. Serve with a lemon wedge on the side for extra brightness.