A quick, low-fat idea for a midweek supper - good if you're on a budget at around £1.15 a head
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Making it creamy
Stir 100g ricotta or quark (a low-fat cheese made without rennet) into the pasta along with the cooked mushrooms.
Making with aubergines
Replace the mushrooms with 1 thickly sliced aubergine and increase the stock to 300ml/½pt. Simmer with the remaining ingredients until the aubergine is soft and the stock nearly reduced away, then toss into the penne.