Method
Preheat your oven to 180°C. Line a tray with baking paper and transfer the tomatillos and garlic cloves. Bake for approximately 20 minutes, until the tomatillos and garlic are softened and starting to brown. Turn over midway for heavenly baking.
After baking, remove the tray from the oven and let cool at room temperature until you can grab the tomatillos with your fingers.
Meanwhile, cook the onion in a small pan on low heat for 5 minutes to remove the raw taste.
Once the content of the tray is cold, remove the garlic husk and transfer all ingredients to a blender, including the juice. Puree until smooth. If you’d like your sauce to be a bit more runny, add tablespoons of cold water one at a time until you achieve your desired consistency.
Add the cooked onion, coriander, chilli flakes, salt, and pepper to taste. Pulse for a few seconds to mix the ingredients.
This tomatillos sauce will keep for up to 3 days refrigerated.