- Elimination
- Reintroduction
- Maintenance
- Dessert
Lemon and Almond Polenta Cake
The cake to bring when you are the one with the diet and would rather not explain it. Nobody can tell it is missing anything.
- Prep
- 20 min
- Cook
- 45 min
- Total
- 1 hr 5 min
- Serves
- 12
Published
Ingredients
Makes 12 slices. Each ingredient is labelled with its FODMAP status at this quantity.
- Low FODMAP
200 g unsalted butter, softened
- Low FODMAP
200 g caster sugar
- Portion-dependent
200 g ground almonds (almond meal)
Low FODMAP at 24 g per serve. This is the ingredient that decides how you cut the cake.
- Low FODMAP
100 g fine polenta or cornmeal
Milled corn — FODMAP-free. Use fine, not coarse, or the crumb turns gritty.
- Low FODMAP
3 eggs
- Low FODMAP
1 1/2 tsp gluten-free baking powder
- Low FODMAP
3 lemons, zest of all three and juice of two
Citrus is low FODMAP and lemon juice is clear at normal amounts.
- Low FODMAP
1/4 tsp salt
- Low FODMAP
75 g icing sugar, for the syrup
What the labels mean
- Low FODMAPSafe at the serving size listed.
- Portion-dependentLow FODMAP only up to the serving size listed — larger servings stack.
Method
Step 1: Heat the oven to 160°C / 320°F fan. Grease a 23 cm springform tin and line the base with parchment.
Step 2: Beat the butter and caster sugar together until pale and noticeably lighter in volume — a full 3 to 4 minutes. This is the only aeration the cake gets, since there is no gluten to trap air.
Step 3: Add the eggs one at a time, beating well after each. If the mixture looks split, add a spoonful of the polenta and keep going.
Step 4: Fold in the ground almonds, polenta, baking powder, salt and the zest of all three lemons. Do not beat at this stage — you want it just combined.
Step 5: Scrape into the tin, level the top and bake for 40 to 45 minutes, until golden and a skewer comes out with a few moist crumbs. It should still have a slight wobble in the centre.
Step 6: While it bakes, warm the juice of two lemons with the icing sugar until dissolved. Prick the hot cake all over with a skewer and pour the syrup slowly over the surface, letting each addition soak in.
Step 7: Cool completely in the tin before releasing. Warm, it will not hold together; cold, it slices cleanly.
Notes and swaps
- Cut it into twelve. That is not a serving suggestion, it is the almond meal limit — eight generous slices would put each one past 24 g.
- It improves overnight. The syrup keeps migrating through the crumb, and day two is better than day one.
- Fine polenta only. The coarse stuff sold for making wet polenta never softens fully in a cake and leaves a sandy texture.
There is a particular social cost to this diet that has nothing to do with symptoms. Someone has a birthday, you bring something, and either you explain the whole protocol to a room of people who did not ask, or you bring a cake you cannot eat.
This is the one that solves it, because it is not a low-FODMAP version of anything. Lemon polenta cake is a real Italian cake that happens, entirely by accident, to contain nothing you need to avoid.
What replaces the flour
Two things, doing different jobs.
Ground almonds provide fat and protein, which is where the moisture and the dense, slightly fudgy crumb come from. Polenta — milled corn, nothing more — provides the structure and the faint golden graininess that makes the texture distinctive rather than merely gluten-free.
Neither is a substitute. This is how the cake has always been made.
How you cut it is part of the recipe
Almond meal is low FODMAP at 24 g per serving. Above that the GOS content starts to matter.
A 200 g cake cut into twelve slices puts roughly 17 g in each — comfortable headroom. The same cake cut into eight puts 25 g in each, which is over the line before you have eaten anything else that day.
This is worth internalising because it is a pattern that repeats across the whole protocol: the same food is safe or not depending only on how much of it lands on the plate. Nothing about the cake changes. The knife decides.
The syrup step matters
It is tempting to skip, and the cake is noticeably worse without it.
Almond-and-polenta cakes are drier than wheat cakes by construction — there is no gluten network holding water. The lemon syrup is what puts the moisture back, and it has to go on while the cake is hot and the tin is still on the rack, so it soaks rather than pools.
Prick the surface more thoroughly than feels necessary, and add the syrup in three or four goes rather than all at once.
Read next
Guide
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