Oat
Oat Groats
Avena sativa
Iron Age Europe; Scottish and Nordic staple
In the atlas
Oats were the grain of poor soils and wet summers — Scotland, Ireland, Scandinavia. A groat is the whole kernel after the inedible hull is removed. Rolled oats are just groats steamed and flattened; steel-cut are groats chopped. Mill groats and you get a sweet, high-fat flour that goes rancid if you ignore it.
Origin. Domesticated in Europe from a wheat-field weed
Flavor. Cookie dough, cream, brown sugar.
Worth knowing
- Naturally gluten-free, but often contaminated with wheat in shared mills. Buy certified GF if that matters.
- Avenin is the oat protein — not gluten.
- Highest fat of the common cereals (~6–8%), mostly in the groat, not a separate germ you can skip.
- Oat flour makes cookies tender and bread gummy above ~20% unless you add structure.
Flours you can make
| Flour | Extraction | Protein | Gluten | Notes |
|---|---|---|---|---|
| Whole-grain flour | 100% | 13.5% | 0% | Everything the berry holds — bran, germ, and endosperm. Mill 1:1 by weight. Use within days, or freeze. |
| High-extraction (85%) | 85% | 13.4% | 0% | Sift once through a #30–#40 sieve. Keeps most flavor and minerals, slightly stronger dough than 100%. |
| Sifted / bolted flour | 75% | 13.2% | 0% | Second sifting (#50–#60). Lighter crumb, longer shelf life, less fiber. Bran left behind is gold in porridge. |
Nutrition / 100 g
- Calories
- 389 kcal
- Protein
- 13.5 g
- Carbs
- 66 g
- Fiber
- 10.6 g
- Fat
- 6.9 g
- Iron
- 4.7 mg
- Magnesium
- 177 mg
- Zinc
- 4 mg
- Thiamin
- 0.76 mg
- Selenium
- 29 µg
Typical whole-grain flour / 100 g.
Sources & USDA linksBuy it retail
- Bob's Red Mill (groats)
- Azure Standard
- Pleasant Hill Grain
- GF-certified brands (if needed)
- Anson Mills
Availability rotates by harvest. Search the berry name plus “food grade.”
Bakes well as
Mill Oat Groats now
Miller’s desk
Grain to flour
Vital wheat gluten booster
Most bags of vital wheat gluten are 75–80% protein. The booster is added on top of the flour, not swapped in.
Whole-grain flour · No gluten
- Whole grain needed
- 505 g
- Flour you’ll get
- 500 g
- Bran left behind
- 0 g
- Protein in that flour
- 67.5 g · 13.5%
- Natural gluten
- 0%
- Add VWG
- None needed
- After VWG
- 13.5% protein · 0% gluten
About 3.2 cups of berries → 4.8 cups of whole-grain flour. Whole-grain milling is essentially 1:1 by weight; sifting is where you lose bran.
How to mill it
Freeze groats and flour. The oils go paint-rancid at room temp.
Fine, slow feed — high oil can smear stones if you rush.
Tempering: Never. You'll make paste.
Everything the berry holds — bran, germ, and endosperm. Mill 1:1 by weight. Use within days, or freeze.
Milling 101 →Next: bake it
Pick a loaf for this flour
13.5% protein after VWG · Oat Groats whole-grain flour. Sandwich loaf, focaccia, sourdough — the kitchen will scale dough, hydration, and times to this mix.
