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Twelve syrups and mixers, by ratio

Sweetener is where most home drinks go wrong, and it is the cheapest thing on the counter to get right. Everything below is sugar and water in some proportion, with something steeped in it. The technique behind all of them is on simple, rich and flavored syrups.

The keeping column says what kind of thing each syrup is and which failure shows up first, because that is what you can actually observe in your own refrigerator. It deliberately gives no day counts — for those, use the published cold-storage times rather than a number invented here: FoodSafety.gov cold food storage charts. Syrups with fruit or dairy in them behave like the ingredient they carry, not like sugar.

Twelve syrups and mixers
SyrupRatioMethodActive timeKeeping type, and what fails firstUsed in
Simple Syrup1:1 sugar to waterWarm the water, stir the sugar in until the liquid turns clear, take it off the heat. Do not let it boil.5 minSugar and waterLongest keeper on this page. Fermentation is what gets it: the first haze, or a stray bubble climbing the side of the bottle, is the sign — a 1:1 syrup has enough water to support it.
Rich Syrup (2:1)2:1 sugar to waterSame method, twice the sugar. It needs a little more stirring and slightly more patience before it goes clear.8 minSugar and waterOutlasts 1:1, because there is less free water for anything to ferment in. Its failure runs the other way: sugar dropping back out as crystals around the neck and cap.
Demerara Syrup2:1 demerara sugar to waterAs rich syrup, using demerara or turbinado sugar. It takes slightly longer to dissolve because the crystals are larger.10 minSugar and waterKeeps as long as rich syrup. What shows first is a fine sediment settling to the bottom, since unrefined sugar carries solids that never fully went into solution.
Vanilla Syrup1:1 plus 1 split pod per cupMake simple syrup, split the pod lengthwise and scrape the seeds in, then add the pod and steep off the heat with the lid on.5 min plus 30 min steepingSteeped aromaticKeeps like the syrup underneath it, but the aroma is the perishable part and it goes long before anything else. Expect it to smell noticeably flatter while it still looks perfect.
Cinnamon Syrup1:1 plus 2 sticks per cupBreak the sticks, add them to the finished syrup off the heat, and leave covered. Strain before bottling.5 min plus 45 min steepingWhole spiceWhole spice adds almost no water, so this keeps like plain syrup. The spice deepens for the first few days, then dulls; any powder that came off the sticks settles into a layer.
Ginger Syrup1:1 plus 1/2 cup sliced ginger per cupSlice the ginger thin, steep it in the hot syrup off the heat, then strain. Longer steeping makes it sharper, not just stronger.10 min plus 30 min steepingFresh plant matterShorter than a plain syrup, because fresh root gives up water and plant material into the bottle. Cloudiness is what appears first, usually before any change in smell.
Honey Syrup3:1 honey to warm waterWhisk honey into warm — not hot — water until it flows freely. No cooking required.3 minUncookedNever cooked, so it behaves like a diluted raw ingredient rather than a boiled syrup. Separation into a thin layer over a thick one comes first; shaking fixes the look and not the age.
Mint Syrup1:1 plus 1 packed cup of leaves per cupSteep whole leaves in the hot syrup off the heat for no more than fifteen minutes, then strain and press gently.5 min plus 15 min steepingSoft herbThe shortest-lived of the sugar syrups here. Color and aroma fail well ahead of the syrup itself: green shifts to olive and the smell turns hay-like while the liquid still looks fine.
Strawberry Syrup1:1:1 fruit, sugar and waterWarm all three together until the fruit collapses, then strain through a fine sieve without pressing the solids.15 minFruit pulp and juiceKeeps least like a syrup and most like the fruit in it, because it carries fruit water, pulp and fruit sugars. Fermentation is the failure: tiny bubbles, a lid that has lifted, or a smell gone sharp and yeasty.
Lavender Syrup1:1 plus 1 tbsp buds per cupSteep culinary lavender buds in the hot syrup off the heat, strain at ten minutes, taste, and stop there.5 min plus 10 min steepingDried floralDried material adds no water, so the syrup itself keeps like plain syrup. The aroma is what ages, and it drifts from floral toward soapy rather than simply fading.
Chai Concentrate4:1 water to sugar, plus tea and whole spicesSimmer cracked whole spices in water, take it off the heat, add black tea for five minutes, strain, then dissolve the sugar while it is hot.25 minBrewed tea baseMostly brewed tea, so it keeps on tea terms rather than syrup terms. It turns tannic and flat first; a film on the surface means it is well past that point.
Citrus Cordial2:1:1 sugar, water and mixed citrus juiceMake a rich syrup, cool it completely, then stir the juice in cold. Add a wide strip of peel and refrigerate overnight.10 min plus overnightRaw juiceContains uncooked citrus juice, so treat it as a fresh-juice product and the shortest keeper on this page after mint. Brightness goes first, then it clouds.