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Know Your Oats

By Cook's Illustrated Published July 2009

Whole, hulled oats are also known as groats. After being heated to inhibit rancidity, they are further processed, according to the particular style.

Steel-Cut Oats

  • Groats sliced into three or four pieces by steel blades.
  • Also called Irish or "pinhead" oats.
  • Cooking Time: 10-20 minutes

Stone-Ground Oats

  • Groats coarsely stone ground.
  • Also called Scotting or "porridge" oats.
  • Cooking Time: 10 minutes

Old-Fashioned or Rolled Oats

  • Groats steamed and rolled flat (or "flaked").
  • Cooking Time: 5-20 minutes

Quick Oats

  • Steel-cut oats steamed and rolled to one third (or less) the thickness of regular rolled oats.
  • Cooking Time: 1 minute

Instant Oats

  • Very finely cut groats rapidly cooked and rolled flat.
  • Cooking Time: Instant