Classic British Liver and Onions with Bacon & Pan Gravy
Tender pan‑fried calf's liver, sweet slow‑caramelised onions, crisp bacon lardons and a glossy pan gravy — a proper British comfort dish that sings when the liver is treated with a little care.
Liver and onions — the comfort dish your granny could cook with one eye closed and a pot of tea in the other hand. It’s quick, fiercely flavoured and absolutely worth rescuing from dreary reputation.
This version uses calf's (veal) liver for a milder, silkier finish, caramelised onions for sweetness and crisp bacon for texture. Treat the liver right (short, hot sear; a brief soak and a proper rest) and you’ll have something tender, savoury and surprisingly elegant.
Serve with mashed potato or buttered greens and a lemon wedge for a classic, no‑fuss British supper that won't break the bank or take all evening.
Ingredients
- 600 g calf's (veal) liver
- 300 ml full‑fat milk — for soaking
- 150 g streaky bacon — cut into lardons
- 2 large onions — about 400g, peeled and thinly sliced
- 50 g plain (all‑purpose) flour — for dredging, mix with salt & pepper
- 50 g butter
- 30 ml vegetable oil
- 150 ml beef stock — or strong beef consommé
- 30 ml red wine or good balsamic vinegar — optional — for deglaze and depth
- 15 ml Worcestershire sauce
- 30 ml flatleaf parsley — finely chopped
- 1 lemon — cut into wedges, to serve
- sea salt — to taste (approx 1 tsp for dredge + seasoning)
- black pepper — freshly ground, to taste
- 5 ml caster sugar — optional — helps caramelise onions
Equipment
- heavy frying pan or cast‑iron skillet (recommended)
- separate frying pan (for bacon)
- splatter screen (optional, helpful)
- instant‑read thermometer (optional, useful for doneness)
Instructions
Trim the liver: remove any connective tissue and membranes, then slice into 8 equal-ish pieces (about 75g each). Place liver in a bowl and cover with 300ml milk. Chill and soak for 30 minutes.
While the liver soaks, prepare onions and bacon. Slice the onions thinly and cut the bacon into lardons.
Caramelise the onions: heat 1 tbsp oil + 25g butter in a large frying pan over medium–low. Add the sliced onions, a pinch of salt and 1 tsp caster sugar (if using). Cook gently, stirring every few minutes, until deep golden and sweet — about 20–25 minutes.
Cook the bacon: in a separate pan over medium heat, fry the lardons until crisp and golden, about 6–8 minutes. Transfer to a plate lined with kitchen paper and reserve the fat in the pan.
Drain the liver from the milk and very thoroughly pat each slice dry with kitchen paper — moisture = steam = no crust. Season the flour with a teaspoon of sea salt and a good grind of black pepper, then dredge each slice lightly in the flour.
Heat a heavy frying pan (cast‑iron recommended) over medium–high. Add remaining 1 tbsp oil and 25g butter and let the foaming stop so it’s hot but not smoking. Add half the liver slices, spacing them so they don’t touch. Sear the first side without moving for 2–2½ minutes until golden.
Flip each slice and cook the second side for 1½–2 minutes for medium (slightly pink centre). Remove to a warm plate and repeat with the remaining liver. Do not overcook — liver becomes grainy and dry if cooked through.
Rest the cooked liver, tented loosely with foil, for 3 minutes. Resting lets the juices redistribute.
Make the pan gravy: pour off any excess fat from the frying pan, leave any browned bits. Over medium heat, add the beef stock, red wine (or 2 tbsp balsamic), and Worcestershire sauce. Scrape the pan to lift the fond. Stir in the reserved bacon and caramelised onions and simmer to reduce and thicken for 3–4 minutes until glossy. Finish by swirling in the remaining 25g butter and most of the chopped parsley.
Serve: spoon the onion‑and‑bacon gravy over the rested liver slices, sprinkle with remaining parsley and serve with lemon wedges. Best with mashed potatoes or buttered greens.
Tips
- Always pat liver very dry after soaking — excess moisture prevents browning and leads to a grey, boiled texture.
- Caramelise the onions low and slow (20–25 minutes). A little patience here gives the sauce its sweet backbone.
- Cook liver quickly over high heat and rest for 3 minutes; overcooking is the most common ruinous mistake.
- Make the onions and bacon ahead: both keep in the fridge and can be reheated in the pan when you're ready, saving time on the night.
- If you want a silkier gravy, finish with a knob of cold butter off the heat and swirl until glossy.
Substitutions
calf's (veal) liver → lamb liver (same quantity) — slightly stronger flavour and firmer texture
Noticeably differentstreaky bacon → pancetta (same quantity) — similar saltiness but less smoky
Stays closefull‑fat milk (for soaking) → buttermilk or plain yoghurt thinned with a splash of water (same volume) — tenderises and gives a tangy note
Stays closeplain (all‑purpose) flour → gluten‑free plain flour (same weight) — keeps the dredge effect, tiny change in crust
Stays close
Nutrition
Per serving · estimated
- 610
- Calories
- 38 g
- Protein
- 19 g
- Carbs
- 46 g
- Fat
- 2 g
- Fibre
- 8 g
- Sugar
- 750 mg
- Sodium
FAQ
How do I tell when liver is cooked?
Aim for slightly pink in the centre — the outside should be golden but the middle tender. Cook 2–2½ minutes per side for typical 1cm–1.5cm slices; overcooked liver becomes grainy and dry.
Can I use frozen liver?
Yes — thaw fully in the fridge, pat dry and use immediately. Texture is best with fresh or properly thawed liver.
Why soak liver in milk?
Soaking mellows the metallic/tangy flavours and gives a softer texture. It’s traditional but optional if you like a stronger taste.
Can I make this ahead?
You can caramelise the onions and cook the bacon a day ahead. Reheat gently and finish the liver just before serving for best texture.
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