To soften butter: When you need to soften butter in a hurry, grate the solid cube on the largest holes of a cheese grater. If you need melted butter, place the grated butter in a small saucepan on very low heat. It melts much faster this way.
Squeezing lemons: My sister-in-law from Italy - a phenomenal cook - showed me this trick. For a fast way to juice lemons without having to clean a juicer, first roll the lemon (or lime) on the cutting board, applying pressure to soften it. Cut the lemon in half. With a fork, poke lots of holes in the lemon half and then squeeze both sides of the half together (towards the fork) twisting the fork every which way. Lots of juice!
Have a great day and send me some of your tips!