Cornmeal Johnnycakes: The Soak That Separates Them From Polenta
A johnnycake is cornmeal, water and salt cooked on a griddle, and it lives or dies on one step: soaking the meal before the batter is mixed. Skip the soak and you get gritty, sandy cakes that taste raw in the middle. Give it twenty minutes and the meal hydrates fully, the cakes come out tender, and a 250 g batch costs you about eight minutes of actual work.
Ingredient card
| Item | Amount |
|---|---|
| Medium-grind cornmeal (not polenta) | 250 g |
| Boiling water | 250 ml |
| Buttermilk | 300 ml |
| Large egg | 2 |
| Caster sugar | 2 tsp |
| Baking powder | 2 tsp |
| Baking soda | 1/2 tsp |
| Fine salt | 1 tsp |
| Melted butter or bacon fat | 40 g |
Scaling
for 2: Halve to 125 g cornmeal and 1 egg. Use a 20 cm griddle and expect 6 cakes.
for 4: As written — 250 g cornmeal, 12 cakes at 8 cm across. The timings below assume this batch.
for 8: Double, but soak the cornmeal in two bowls. A single bowl of 500 g cornmeal and 500 ml buttermilk will not hydrate evenly; you get dry pockets in the middle of the bowl.
Time budget and burner map
Make ahead
- Soak the cornmeal the night before in the boiling water, cover, refrigerate. Cold soaked meal makes a slightly thicker batter and the cakes hold their shape better on the griddle.
- Mix the dry leaveners with the salt in a small bowl ahead of time. They must not go in until the last moment or they start reacting in the batter.
- Hold finished cakes in a 90 °C oven on a rack, in one layer. Stacked, they sweat and the crust goes soft within three minutes.
To the pass
- Two cakes overlapping slightly, not stacked, so the top one shows a full face.
- Butter while hot so it melts through the top rather than sitting on it.
- Syrup at the edge of the plate in a pool, not poured over the cakes. Cornmeal absorbs fast and a poured cake goes soggy in 40 seconds.
Where it goes wrong
- Using polenta or coarse grits. Polenta grind is too large to hydrate in 20 minutes and the cakes stay gritty. Medium-grind cornmeal is the correct grade — it should feel like fine sand, not gravel.
- Skipping the boiling water. Cold-buttermilk-only batters never fully hydrate the meal; the cakes taste floury and raw in the middle no matter how long you cook them.
- Pressing the cakes with the spatula. Cornmeal batters are fragile before they set; one press and you have a cracked disc that breaks on the flip.
The method, in full
Why boiling water and not cold buttermilk
Cornmeal is a starch granule with a tough outer shell. Below about 70 °C, water penetrates slowly — that is why a cold-mixed cornmeal batter still tastes gritty after cooking. Boiling water gelatinises the surface starch on contact and opens the granule, so the remaining 20 minutes of soaking is enough to hydrate it all the way through.
The paste you get is stiff and slightly translucent at the edges. That is correct. If it looks like wet sand, your water was not hot enough or your meal is too coarse.
Griddle temperature and the no-press rule
180 °C. Higher and the outside sets before the inside loses its raw starch taste; lower and the cakes spread thin and dry out. On a cast-iron griddle over medium gas, that is about 6 minutes of preheat. Test with a drop of batter: it should set at the edges in 20 seconds without colouring instantly.
Cornmeal batters have almost no gluten structure to hold them together, so they rely entirely on the set starch. Do not press, do not move them for the first three minutes, and flip once with a wide thin spatula slid fully underneath.
Sweet or savoury, and what to serve with them
The recipe above is neutral. For a savoury version, drop the sugar, add a teaspoon of black pepper and 100 g of cooked, crumbled bacon or grated cheddar, and serve with a fried egg on top — which is how they appear on a brunch board. For sweet, keep the sugar, add a teaspoon of cinnamon, and serve with honey rather than maple, which is a better match for the corn flavour.
Leftover cakes are better reheated in a dry pan than in a toaster, which dries them into crackers. Two minutes a side over medium-low brings them back.
Kitchen questions
Can I use self-raising cornmeal mix?
Yes, and it is a common shortcut in the southern US. Drop the baking powder and soda, keep the salt, and expect a slightly softer crumb because the mix usually carries some flour.
Why are my johnnycakes crumbly?
Too little fat or an over-rested batter. The fat coats the meal particles and holds them; if you cut it below 30 g per 250 g of meal, the cakes break. If the batter sat more than 30 minutes, add a tablespoon of buttermilk before cooking.
Are these gluten free?
Cornmeal itself is, but check the package — many brands are milled in facilities that also handle wheat and are labelled as such. If you need strictly gluten free, buy cornmeal certified for it. This is general information, not dietary advice.
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