How to Cook Ox Liver and Onions

Ox liver and onions is a proper British classic. Tender slices of beef liver, slowly cooked onions and plenty of rich gravy. Nothing fancy, just a good, hearty dinner that has been enjoyed for generations.

It's also an affordable way to enjoy a traditional cut of meat. Served with creamy mashed potatoes and a few vegetables, liver and onions makes a satisfying family meal without costing a fortune.

This recipe keeps things simple. We'll explain how to cook ox liver, how to make a good onion gravy, and how to stop the liver becoming unnecessarily tough or dry.

What is ox liver?

Ox liver is the traditional name commonly used in British butchery for liver from cattle. It's essentially beef liver, although the flavour and texture can vary depending on the age of the animal.

Beef liver has a stronger, more distinctive flavour than lamb's liver, which makes it particularly good with onions and gravy.

Our fresh beef liver is sourced from British or Irish cattle, carefully trimmed and sliced by our butchers, ready for cooking.

Ox liver and onions ingredients

This traditional ox liver recipe serves four people.

• 500g ox liver (beef liver), sliced
• 2 large onions, thinly sliced
• 2 tbsp plain flour, for coating
• 1 tbsp plain flour, for the gravy
• 2 tbsp vegetable oil
• 20g butter
• 300ml beef stock
• 1 tsp Worcestershire sauce (optional)
• Salt and freshly ground black pepper
• Mashed potatoes and vegetables, to serve

Buying your liver: Our beef liver is sold in 1kg packs, so you'll have enough for two batches of this recipe. Use half for dinner and freeze the remaining liver in a suitable portion for another day.

How to cook ox liver and onions

1. Remove the liver from its packaging and pat dry with kitchen paper. Trim away any remaining tough membrane.
2. Season 2 tablespoons of flour with salt and pepper, then lightly coat the liver slices. Shake off any excess and discard the remaining coating flour.
3. Heat 1 tablespoon of oil and the butter in a frying pan over a medium-low heat.
4. Add the sliced onions and cook gently for around 12–15 minutes, stirring occasionally, until soft and lightly golden. Remove from the pan and set aside.
5. Add the remaining oil to the pan and increase to a medium heat.
6. Add the liver slices and fry for approximately 7–8 minutes in total, turning occasionally. Cook in batches if necessary.
7. Make sure the liver is cooked thoroughly, with no pink remaining. Use a food thermometer to check the centre reaches 75°C for at least 30 seconds, or an equivalent safe time and temperature.
8. Transfer the cooked liver to a warm plate.
9. Add the remaining tablespoon of flour to the pan and stir for around 30 seconds. Gradually pour in the beef stock, stirring to make a smooth gravy.
10. Add the Worcestershire sauce, if using, and return the onions to the pan. Simmer for 3–5 minutes until the gravy has thickened.
11. Return the liver briefly to the hot gravy, then serve straight away with mashed potatoes and vegetables.

How do you keep ox liver tender?

The biggest mistake people make with liver is cooking it for too long.

Liver needs to be thoroughly cooked, but leaving it in a hot pan long after it's done can make it dry and tough.

A few simple tips can make a difference:

• Use evenly sliced liver: Similar-sized pieces cook more consistently.
• Remove tough membranes: Trim away any connective tissue before cooking.
• Don't overcrowd the pan: Cook in batches if necessary.
• Keep the heat moderate: You want the liver to cook through without drying out.
• Don't cook it longer than necessary: Use a food thermometer to check it's thoroughly cooked.

A good onion gravy helps too. It adds moisture and balances the liver's rich flavour.

Should you soak ox liver in milk before cooking?

Some traditional recipes recommend soaking ox liver in milk before cooking.

This is usually done to give the liver a milder flavour, particularly if someone finds beef liver a little strong.

You don't have to soak it, but if you want to try it, place the liver in a bowl of milk and refrigerate for around 30 minutes. Drain, pat dry and cook as normal.

Always discard the milk afterwards.

How long does ox liver take to cook?

Thinly sliced ox liver will often take approximately 7–8 minutes to pan fry, although thicker slices may take longer.

Cooking time depends on the thickness of the liver and the heat of your frying pan, so don't rely on the clock alone.

Unlike a whole beef steak, liver needs to be cooked thoroughly. Make sure it's steaming hot throughout, with no pink remaining, and check the internal temperature with a food thermometer where possible.

How to make gravy for liver and onions

A proper onion gravy is what brings this dish together.

Once you've cooked the liver, use the same frying pan to make the gravy. Add a little flour, gradually stir in beef stock and return the softened onions to the pan.

A splash of Worcestershire sauce works well if you enjoy a deeper, savoury flavour.

Let the gravy simmer until it thickens, then add the liver back briefly before serving.

For a thinner gravy, add a little more stock. For a thicker gravy, let it simmer a little longer.

What to serve with ox liver and onions

For me, liver and onions is best served with creamy mashed potatoes and plenty of gravy. It's a proper old-fashioned dinner, and there's no reason to complicate it.

It also works well with:

• Buttered cabbage
• Garden peas
• Steamed carrots
• Boiled new potatoes
• Green beans
• Extra onion gravy

You can also add a little cooked bacon to the dish if you fancy something different.

Where can you buy ox liver in the UK?

Ox liver is available from traditional butchers and some supermarkets, although it's not always stocked everywhere.

At True Bites Family Butchers, we sell fresh beef liver online, prepared and sliced by our butchers from British or Irish cattle.

Our liver is supplied in 1kg packs and delivered chilled, ready for cooking or home freezing.

If you enjoy traditional cuts of meat, take a look at our offal collection for more old-fashioned butcher's favourites.

FAQs

Is ox liver the same as beef liver?

Yes. Ox liver is a traditional British name commonly used for liver from cattle. Beef liver and ox liver generally refer to the same type of offal.

How do you cook ox liver without it going tough?

Use evenly sliced liver, cook over a moderate heat and avoid leaving it in the pan longer than necessary. Liver must be thoroughly cooked, but excessive cooking can make it dry and tough.

Do you have to soak ox liver before cooking?

No. Soaking ox liver in milk is optional. Some people use this method to soften its strong flavour, but freshly prepared liver can be cooked without soaking.

Can you cook ox liver with onions and gravy?

Yes. Ox liver with onions and gravy is one of the traditional ways to prepare beef liver in British cooking. The sweetness of the onions works particularly well with its rich flavour.

Can you freeze ox liver?

Yes. Fresh ox liver is suitable for home freezing. Divide into suitable portions, freeze promptly and defrost thoroughly in the fridge before cooking.

Is ox liver good for you?

Ox liver is naturally rich in protein, iron and vitamin B12, but it's also particularly high in vitamin A. The NHS advises limiting liver and liver products to no more than once a week and avoiding them altogether during pregnancy.

A proper British classic

Ox liver and onions might be a little old-fashioned, but sometimes the traditional recipes are the ones worth keeping.

It's simple, satisfying and makes good use of a cut that has been part of British butchery for generations.

If you fancy giving it a go, our fresh beef liver is available online, trimmed and sliced by our family butchers and delivered straight to your door.