French Onion Sausage Casserole with Potato Rosti Croutons
By Lisa Faulkner
Published on 11 January 2024
This family-friendly French Onion Sausage Casserole with Potato Rosti Croutons, by Celebrity MasterChef winner and OcadoLife regular Lisa Faulkner, is a moreish cross between a sausage casserole and French onion soup, with plenty of extra veg thrown in. Using frozen sausages and veg makes it a super-easy midweek meal – and the ready-prepped onions will save you lots of chopping time! Looking for more Lisa Faulkner recipes? Look no further.
Time and servings
50 minsTotal time
Serves 4691 kcal/serving
5 minsPrep time
45 minsCooking time
Ingredients
- 1 tbsp olive oil, plus a splash
- 8 frozen sausages
- 500g frozen chopped onions
- 50g unsalted butter
- 1 tbsp red wine vinegar (or malt vinegar)
- 2 tbsp flour
- 900ml beef stock, hot
- 200g frozen seasonal greens
- 150g frozen peas
- 8 frozen potato rosti
Method
Step 1
. Heat a splash of oil in an ovenproof heavy-based pan or casserole dish, add the frozen sausages and brown them over a medium-high heat, turning, for about 5 mins. Remove to a plate and set aside. Preheat the oven to 200°C/180°C fan/gas 6.Step 2
Using the same pan, add 1 tbsp oil, then the frozen onions; fry them over a medium heat for a few mins until they’re starting to soften. Add the butter and cook for a few mins more. Add the vinegar and some seasoning, reduce the heat to low and cook for 10-15 mins, stirring occasionally.Step 3
Add the flour, stirring while it cooks for a couple of mins, then gradually add the hot stock, stirring continuously, until starting to thicken. Turn the heat to high and bring to the boil; add the sausages.Step 4
Transfer the pan to the oven and cook, uncovered, for 10 mins. Remove, add the frozen greens and peas; cook for a further 10-12 mins.Step 5
Meanwhile, put the frozen rosti on a baking tray. Place in the oven with the casserole for 20 mins, until cooked through and golden.Step 6
Give the casserole a good stir, arrange the rosti on top and serve.