While I haven't tried this yet, you could also add herbs or spices (parsley, oregano, basil, and garlic are some good ones) for more flavor.
Pop the container in the freezer overnight. This will cool the oil quickly, but frozen oil is a bit too hard.
In the morning, move the container to the fridge and let it soften.
After some softening time in the fridge, the olive oil should now be a nice spreadable consistency.
Be careful to return it to the fridge soon after use as it will liquify quickly at room temperature.
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