Preheat oven to 220ºC. In a large skillet, add grape seed oil and heat to medium-high. Salt the cod filets and quickly sear each side. Transfer to a baking tray.
Bake for approximately 8 minutes. Carefully remove from oven and sprinkle Aged Havarti cheese over each filet. Return to oven and cook for an additional 3 minutes. Serve with vegetable sticks and a crispy green salad on the side.
Add butter to a large skillet over medium-high heat. Cook until butter begins to brown. Add sweet potatoes and sauté for 2 minutes. Then add zucchini, thyme, garlic and lemon zest. Continue to cook for an additional minute. Remove from heat and season with salt and pepper.