Hot Dog Onions recipe

Ingredients

• 30 ml (2 tbsp)neutral oil, such as rapeseed or vegetable oil
• 680 g (1½ lb)white or yellow onions, peeled and sliced into 6 mm rings or half-moons, or chopped
• 2 clovesgarlic, minced
• 10 ml (2 tsp)paprika, ideally an even split of sweet and smoked
• 2.5 ml (½ tsp), or more to tastechilli powder
• A pinch (1/16 tsp)ground cinnamon
• To tastekosher salt and ground black pepper
• 2 heaped tbsptomato purée
• 5 ml (1 tsp), packed, or more to tastelight brown sugar
• 180 ml (¾ cup)unsalted stock or water
• 10 ml (2 tsp)hot pepper sauce, such as Frank’s RedHot
• 22.5 ml (1½ tbsp), or more to tasteapple cider vinegar

Instructions

1. 1

   Soften the onions

   Heat the oil in a large frying pan over a medium heat. When it shimmers, add the onions and cook, stirring occasionally, for 8–10 minutes until softened and just starting to turn golden. Lower the heat if they begin to brown.

2. 2

   Add the aromatics

   Add the garlic, paprika, chilli powder, 1 teaspoon of salt and ½ teaspoon of pepper. Stir constantly for about 30 seconds, until fragrant.

3. 3

   Cook the tomato

   Stir in the tomato purée and sugar. Cook, stirring constantly, for about 2 minutes, until the tomato purée has caramelised.

4. 4

   Add the liquids

   Pour in the stock or water and hot pepper sauce. Stir, scraping up any browned bits from the bottom of the pan.

5. 5

   Simmer the onions

   Raise the heat to medium-high and bring the mixture to a rapid simmer, then immediately lower the heat to maintain a gentle simmer. Cook for about 20 minutes, stirring occasionally, until the onions are very tender and most of the liquid has evaporated. If it evaporates too quickly, add more stock or water as needed.

6. 6

   Finish with vinegar

   Stir in the vinegar and cook for a further 5 minutes, stirring frequently, until the onions are meltingly tender and the sauce is thick. Taste and adjust with more salt, pepper, sugar, vinegar or hot pepper sauce as desired.

7. 7

   Serve or store

   Spoon the onion sauce over hot dogs, burgers, wraps or other dishes. To store it, let it cool completely to room temperature, then transfer it to an airtight container and refrigerate.

What is hot dog onion sauce?

This is a cooked onion topping associated with New York City street-cart hot dogs, rather than a raw onion relish. The onions simmer with tomato, spice and vinegar until soft enough to sit neatly on a frank.

Here, paprika brings a smoky-sweet note, while chilli sauce and cider vinegar add heat and tang. Cooking the onions gently gives the sauce time to thicken without losing their texture completely.

Nutrition and macros by portion

The nutrition label shows one serving as written: 47 calories, 1g protein, 6g carbs, 2g fat.

The onions and brown sugar provide most of the carbohydrates, while the oil contributes most of the fat. The small amount of protein comes mainly from the onions and tomato purée; serve the sauce with a protein-rich frank or another filling topping, plus a fresh side, to make a more balanced plate.

Choosing and preparing the onions

Onion choice: White or yellow onions both work; either will soften and sweeten as it cooks. Slice them into rings or half-moons for distinct strands, or chop them if you prefer a more spoonable sauce.

Slice size: Keep the pieces reasonably even so they soften at roughly the same pace. Thin slices melt into the sauce more readily, while thicker ones remain more noticeable.

Build the flavour in stages

Gentle start: Cook the onions until soft and barely golden, not deeply browned. Lower the heat if they colour too quickly, since the recipe is aiming for tender onions rather than a dark, caramelised base.

Tomato and spice: Briefly cooking the tomato purée with the sugar helps it caramelise before the stock or water goes in. Stir constantly at this stage so the mixture does not catch on the pan.

Keep the simmer gentle

After bringing the liquid to a rapid simmer, turn the heat down straight away. A gentle simmer gives the onions about 20 minutes to become very tender while the sauce reduces.

Watch the pan: If the liquid disappears before the onions are soft, add more stock or water as needed. The finished mixture should be thick and glossy, not dry or stuck to the base.

Balance the seasoning

The vinegar goes in near the end, then cooks for another 5 minutes. This keeps its tang present while giving it time to blend into the sauce.

Final taste: Adjust the salt, pepper, sugar, vinegar and hot pepper sauce to suit your preference. Add any extra gradually, tasting as you go.

Serving ideas

Classic pairing: Spoon the sauce over hot dogs just before serving, so the soft onions and thick sauce stay on top of the frank. It also works with burgers or tucked into a wrap.

Make it part of a meal with a crisp salad, slaw or another fresh side to balance the rich, sweet-and-tangy topping.

Recipe notes & tips

• Cut the onions to a similar thickness so they soften evenly.
• Keep stirring once the tomato purée and sugar are in the pan to prevent sticking.
• Lower the heat promptly after the sauce reaches a rapid simmer.
• Add extra stock or water if the pan dries out before the onions are tender.
• Taste the sauce after adding the vinegar before adjusting its sweetness or heat.

Variations

• Chopped onions: Chop the onions instead of slicing them for a more unified, spoonable sauce.
• More smoke: Use smoked paprika for the full paprika amount if you prefer a deeper smoky flavour.
• Extra heat: Add more hot pepper sauce at the end, tasting as you go.
• More tang: Stir in a little extra cider vinegar to sharpen the finished sauce.
• Water instead of stock: Use water in place of stock for a straightforward pantry version.

Common mistakes to avoid

• Browning the onions too much: Lower the heat and cook until they are soft and barely golden.
• Burning the tomato purée: Stir constantly while it cooks with the sugar for about 2 minutes.
• Boiling too hard: Reduce the heat after the rapid simmer so the onions soften without the liquid disappearing too quickly.
• Letting the pan dry out: Add more stock or water if the sauce reduces before the onions are tender.
• Adding too much seasoning at once: Make final adjustments gradually, tasting between additions.

How to store

Let the sauce cool completely to room temperature, then store it in an airtight container in the refrigerator. Reheat gently in a pan, adding a splash of water or stock if it has thickened too much.

Frequently asked questions