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French Onion Sausage Casserole with Potato Rosti Croutons

By Lisa Faulkner
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,…
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Time and servings

Total time
Serves 4691 kcal/serving
Prep time
Cooking time

Ingredients

10 total
  • 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

6 steps

  1. 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.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. Step 6

    Give the casserole a good stir, arrange the rosti on top and serve.