01
Fennel
10.0best for soup1 cup : 1 cup
Thin sliced fennel adds anise crunch to salads
10.0
radishes substitute
in soup.
Radishes simmered in Soup adds body, flavor, and nutrition to every spoonful. The substitute should cook down at a similar rate and add comparable texture.
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adjustment for this dish
Fennel sliced 1:1 by cup goes in at the same 12-minute mark as radish but brings anise oil that dominates once the broth reduces; counter with an extra bay leaf and a pinch of fennel seed sautéed in the aromatics, and skim the first 90 seconds of foam because fennel froths more than radish.
02
Cabbage
10.0best for soup1 cup : 1 cup
Shredded for peppery crunch in tacos and slaws
10.0
adjustment for this dish
Cabbage cut in 1-inch squares 1:1 by cup needs 18 minutes to simmer tender rather than radish's 12; add earlier in the reduce step, and stir once at minute 10 to keep the leaves from matting at the bottom where they'd otherwise scorch against the hot body of the pot.
03
Kohlrabi
7.5best for soup1 cup : 1 cup
Mild crunch, slice thin for salad garnish
7.5
adjustment for this dish
Kohlrabi diced 1:1 by cup stays firmer in the simmer than radish; extend the 12-minute window to 15 minutes and check for knife-slide tenderness before seasoning, because its starchy cell wall gives up water slower and the broth body develops on a different curve.
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04
Beets
7.51 cup : 1 cup
Roasted radishes turn mild and tender
7.5
adjustment for this dish
Beets diced 1:1 by cup stain the broth magenta within 5 minutes; pre-roast at 400°F for 30 minutes to mellow the earthiness, then add in the last 8 minutes of simmer — the stock will still warm toward pink, so lean into it by skipping the bay and using dill in the aromatics instead.
05
Cucumber
7.51 cup : 1 cup
Peppery raw but mild when cooked; slice very thin
7.5
adjustment for this dish
Cucumber sliced 1:1 by cup has too much water for a long simmer; add only in the last 3 minutes off-heat so it warms to tender without collapsing, and reduce the initial stock by a third more than you would for radishes to keep the body from thinning out in the final bowl.
06
Celery
7.51 cup : 1 cup
Fresh crunch for salads and crudite platters
7.5
07
Turnips
5.01 cup : 1 cup
Mild crunch, works raw or cooked
5.0
08
Horseradish
5.01 tbsp : 3 tbsp
Grate fresh, milder so use more
5.0
technique for soup
technique
Radishes sliced 1/4 inch thick enter the soup during the last 12 minutes of a simmer, because longer than 15 minutes at 205°F turns them into bitter grey coins and blows sulfur off into the broth. Sauté the aromatics — onion, bay, a garlic clove — in 2 tablespoons of butter first, build the stock, reduce by a quarter to concentrate, then add the radishes so their peppery edge survives into the bowl.
Skim the foam that rises in the first 2 minutes after they go in; it carries the raw bite you want to avoid. Stir once, cover, and hold the temperature just below a rolling boil to keep the slices whole and the broth clear.
Unlike radishes in a meatloaf, which must arrive dry and structural, radishes in soup should give up 30-40% of their water to the broth — that's where the depth and body come from. Season at the end, not the beginning; radish slices concentrate salt as they warm and a front-loaded pot turns harsh by minute ten.
pitfalls to avoid
watch out
Don't simmer the radish slices longer than 15 minutes; past that window they turn grey and dump bitter sulfur compounds into the broth, flattening the aromatics you built early.
watch out
Avoid seasoning the pot before the radishes go in — front-loaded salt concentrates as the slices release water and the final bowl reads harsh instead of warm.
watch out
Skim the foam that rises in the first two minutes after adding the slices; it carries the raw bite and leaving it on the surface clouds the broth for the rest of the simmer.
watch out
Use 1/4 inch slices rather than cubes; cubes sink and break, slices stay suspended at the level of the stock and cook at the same rate as the aromatics.
watch out
Don't blend the soup with the radishes in it; the peppery compounds turn into bitter paste when emulsified — pull the slices first if you want a smooth base.