Prep the Corn: Grease oven tray with oil. Place corn on tray, brush with oil, and season with salt & pepper.
Cook the Corn: Cook the corn on the AirFry setting of your microwave for 30 mins, flipping it halfway. Alternatively, preheat oven to 200°C. Cook corn for 10 mins, flipping halfway. Extend time for more browning.
Prepare the Sauce: Whisk all ingredients for the butter sauce, adjusting seasoning as needed.
Prepare the Mousse: Blend atchar, olive oil, and coconut milk until smooth and frothy, adding more milk or oil as necessary.
Serve: Brush cooked corn with butter sauce, top with coconut atchar mousse, a squeeze of lime, and enjoy!