This radish potato salad with a warm mustard dressing is lighter than the usual mayo style, with just enough bite from the radishes to keep things interesting.
Cook potatoes: Wash the potatoes thoroughly. Place them in a pot, cover with cold water, and add 1 teaspoon of salt. Bring to a boil and cook until fork-tender. This takes about 20–30 minutes, depending on size. They should be tender but not mushy; they will break when tossed.2 lbs waxy potatoes
Let cool slightly: Drain the potatoes and let them cool for a few minutes. Not too long, just enough so you can handle them. They should still be warm when mixed with the dressing.
Make the dressing: While the potatoes are cooking, prepare the dressing. Pour the stock into a small saucepan and bring to a boil. Add the finely chopped onion, remove from heat, and let it steep for 5 minutes.¾ cup vegetable stock + 1 medium onion
Add grainy mustard, Dijon mustard, vinegar, sugar, salt, and pepper to taste. Be generous.1 tablespoon grainy mustard + 2 teaspoons Dijon mustard + 4 tablespoons apple cider vinegar + ½ teaspoon granulated sugar + fine sea salt and ground black pepper
Slice potatoes: Once the potatoes are cool enough to handle, peel and cut them into thick slices. Place them in a large bowl.
Combine: Add the warm dressing to the potatoes and toss gently to combine. Let the salad sit for about 30 minutes to absorb the flavours.
Radishes: Clean, trim, and slice the radishes while the potatoes are resting. Finely chop the dill as well.1 bunch of radishes + 1 small bunch of dill
Toss: Add oil, radishes, and dill to the potatoes. Toss gently again and adjust seasoning with salt, pepper, vinegar, or sugar if needed.3 tablespoons canola + fine sea salt and ground black pepper
Serve: Serve immediately or cover and refrigerate until needed. Before serving, bring to room temperature for about 30 minutes and adjust seasoning again if necessary.
Notes
Best potatoes for salad: Waxy potatoes like Yukon Gold, Charlotte, or similar varieties work best. They hold their shape well after cooking and don’t turn mushy.
Oil: Canola or sunflower oil works well for this style of potato salad. A mild olive oil also works if you prefer a slightly different taste.