Homemade Chestnut Orgeat Soda, Warm and Nutty

Chestnuts show up in my grocery store for about eight weeks a year, and for most of my life I walked past them. Then I made orgeat out of them, the nut syrup usually built on almonds, and understood what the fuss was about. A chestnut orgeat soda tastes like the warm end of fall: roasted, a little sweet, a little earthy, and completely unlike any fruit soda in my rotation. It is also simpler than it sounds, because the blender does the hard part.

The syrup method I am adapting

My base is the oven-roasted chestnut orgeat from The Sifted Field: 7 ounces of shelled chestnuts, 1 and a half cups of sugar and 2 cups of water, simmered for 15 minutes, blended until no large chunks remain, strained through a fine-mesh sieve, and finished with almond and vanilla extracts. That source says the syrup keeps about 3 weeks in the refrigerator, which matches my own batches. A second reference point, the praline chestnut syrup from Tradition Praline, uses the same core idea, chestnuts cooked in sugar and water until the sugar dissolves, and suggests the serving I use here: a few tablespoons of syrup in sparkling water.

How I make it, step by step

I buy roasted, peeled chestnuts in a bag, because peeling fresh chestnuts for a soda syrup is where good intentions go to die. If you start fresh instead, roast them first; the raw flavour is flat and starchy, and roasting is what makes this taste like chestnut rather than potato.

Simmer the chestnuts in the sugar and water for the full 15 minutes. Blend while warm, in the syrup, until the mixture looks like thin nut milk. Strain through the finest sieve you own, pressing gently; a second pass through cheesecloth gives a clearer syrup, and I do it when I am serving this to guests. Stir in the almond and vanilla extracts off the heat. The almond extract is not optional decoration: a small amount lifts the chestnut flavour the same way it does in baking, and the vanilla rounds the edges.

To build the soda, I use 2 tablespoons of syrup over ice with 6 ounces of well-chilled sparkling water, stirred once, gently. Chestnut orgeat is naturally a little creamy, so the glass looks soft and pale gold rather than crystal clear. That is correct, not a flaw.

What a batch costs at my prices

The syrup batch yields about 2 cups after straining, which is 32 tablespoons, or 16 glasses at my 2-tablespoon pour. Prices are what I paid locally in Knoxville this week.

Ingredient	Batch cost
Roasted peeled chestnuts, 7 oz	$4.99
Sugar, 1 and a half cups	$0.57
Almond and vanilla extracts	$0.40
Sparkling water, 6 oz per glass x 16	$2.40
Total for 16 glasses	$8.36
Cost per glass	$0.52

Figure: Cost per glass. Source: author's local prices, Nov 2026 (table above); canned and cafe figures are the author's usual reference prices.

At $0.52 a glass, this is the cheapest soda I have costed this fall, cheaper even than my kiwi lime soda, because one syrup batch stretches to 16 glasses. The chestnuts are nearly all of the ingredient cost, so this is the soda to make when they are on a seasonal display, not at a specialty markup in February.

Serving and storage notes

Serve this cold but not aggressively fizzy; a hard pour knocks the delicate roasted flavour flat, so add the sparkling water last and stir once. It pairs well next to a bright bowl at a party, and I have put it beside the Thanksgiving punch in two builds for exactly that contrast. Leftovers of the syrup are also excellent in hot chocolate or coffee, which is how the last of my batch usually disappears. Refrigerate the syrup and use it within about 3 weeks, per the source recipe above. If a batch separates slightly in the jar, shake it before pouring; blended nut syrups do that, and it changes nothing in the glass. For a warmer-spiced sibling, see my spiced cherry soda, and for the nutty soda itself, make it while the chestnuts are cheap and in season. That window is the whole recipe's secret.