What's The One Gadget, Tool or Utensil You Absolutely Can't Live Without in the Kitchen

It's close to dinner time and I have food on the brain. This makes me wonder: for those of you who spend a lot of time in the kitchen (actually cooking food, that is), what is the most indispensable tool you own? Is it a simple utensil like a knife? Or is it something more gadgety, like a digital thermometer? Let's talk cooking gear.