Goal and options: How to remove white rings from wooden furniture?
output answer: rub a mixture of vinegar and water onto the wood and dry with the grain to polish it clean

Goal and options: To reuse cooking oil.
output answer: Cook 1/4" piece of ginger in it. This will remove previous flavors and odors from whatever was cooked.

Goal and options: To ripen bananas for cooking.
output answer:
Cook the bananas you need for your recipe in a 300F oven for 30 to 40 minutes. Be sure to line the pan with parchment paper or foil as some bananas may leak when cooking. Once the bananas are black and soft, remove them from the oven and let them cool for 20 to 30 minutes.