Goal and options: Prevent diluted coke soda.
output answer: Freeze coke in ice cube tray.

Goal and options: how to prep a lot of onions
output answer: Set aside an afternoon to chop a BUNCH of onions (or other veggies!) then stick them in the freezer to pull out whenever a recipe calls for 'em.

Goal and options: Sharpen a pencil on a rough concrete surface..
output answer:
Hold the pencil in one hand and angle the pencil to the side walk surface. Make the angle about thirty degrees. Move the pencil back and forth until the wood is worn away a little. Rotate the pencil in your and and repeat until pencil point is formed.