Cooking ahead / reheating instructions

While I have not made this specific recipe, I've made very similar preparations many times before.

Personally I'd rather serve this at room temperature or slightly lukewarm (not piping hot).

If I were serving a larger amount I'd probably reheat in a small saucepan covered with a little bit of water. If I were only serving a single portion I'd probably just opt for the microwave.

The main goal for me would be to remove the refrigerator chill not to make it bubbling hot.

See the last step of the instructions for some guidance from Merrill.
Remove the dish from the fridge and serve at room temperature.
Alternatives - serve the Tuscan onion goo cold, like cranberry sauce.
Or heat a few minutes in microwave or on the stovetop.