Cheesy ham & leek gratin

• Cooked ham slices200g
• Leeks500g
• White potatoes800g
• Semi-skimmed milk400ml
• Plain flour30g
• Butter30g
• Mature cheddar100g

Plus salt and pepper. About £4.12 for the amounts used.

Method

1. 1

   Heat the oven to 200°C (180°C fan, gas 6).

2. 2

   Peel and slice 800g potatoes and boil for 6 minutes. Slice 500g leeks and boil for the last 3 minutes. Drain.

3. 3

   Melt 30g butter, stir in 30g flour for 1 minute, then gradually whisk in 400ml milk until thick. Stir in half of 100g grated cheddar.

4. 4

   Layer the potatoes, leeks and 200g torn ham in a baking dish, pour over the sauce and top with the rest of the cheese.

5. 5

   Bake for 25 minutes until golden.