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Slow Cooker Onion Gravy

Slow Cooker Onion Gravy – Make your own rich, sticky onion gravy in your Crock Pot. Perfect with Bangers & Mash, Toad in the Hole or a tasty nut roast!

We love our Slow Cooker Onion Gravy with good old Bangers and Mash as it seems the right comfort food combination for this time of year. Onion gravy is the perfect accompaniment for Toad in the Hole too and also goes down a treat with our nut roast – however you eat it, it’s so much tastier than gravy granules and all that MSG.

Onion gravy is ideal for slow cooking not least because it’s so much easier to caramelise onions in the slow cooker. You get the characteristic rich, sticky flavour (essential to the perfect onion gravy) without the need to stand over a stove stirring onions – simply let the slow cooker do the work for you. It’s the perfect onion gravy for meatlovers and vegetarians alike but using a good quality stock (beef or vegetarian) is essential. I usually opt for a vegetarian stock and I find the gravy isn’t as dark a gravy as using a beef stock, so I add a tablespoon of soy sauce. If you want to heat it up a bit, try adding a teaspoon of horseradish sauce.

Slow Cooker Onion Gravy


Approx 1 litre (1 ¾ pints)

  • 1 kg (about 10 medium) onions
  • 3 tablespoons vegetable oil
  • 3 tablespoons butter
  • 1 tablespoon salt
  • 125 ml (½ cup) white wine
  • 500 ml (2 cups) good quality beef or vegetarian hot stock (I used Marigold Swiss Bouillon)
  • 2 tablespoons Balsamic vinegar
  • 1 teaspoon Dijon mustard
  • 1 teaspoon freshly chopped thyme
  • 2 tablespoons cornflour / cornstarch mixed with a little water
  • Optional: 1 tablespoon soy sauce
  • Grease the inside of your slow cooker pot and add the onions, oil, butter and salt.
  • Stir and place on the lid.
  • Cook on low for at least 6 hours (8 hours if you have the time) to caramelise the onions.
  • Once your onions are caramelised, add the wine, hot stock, balsamic vinegar, Dijon mustard and thyme and give it a good stir.
  • Turn your slow cooker to high and whisk in the cornflour water mix.
  • Replace the lid on your slow cooker but this time prop open the lid with a wooden spoon or spatula.
  • Cook on high for 1 to 2 hours.
  • Ladle your onion gravy into a jug or gravy boat.
  • Serve with a big bowl of Perfect Mashed Potato and sausages.


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Slow Cooker Onion Gravy - Make your own rich, sticky onion gravy in your Crock Pot. Perfect with Bangers & Mash, Toad in the Hole or a tasty nut roast - Delicious!
I’m entering Slow Cooker Onion Gravy into a few challenges this month:

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