Reheat lasagne covered with foil in the oven at 180°C for 25–30 minutes (longer from frozen) until piping hot in the middle, or microwave a portion in short bursts. Reheat once only.
In the oven (best for a whole dish or slice)
- Preheat the oven to 180°C (fan 160°C, gas mark 4).
- Cover the lasagne with foil so the top doesn't dry out or burn.
- Heat for 25–30 minutes from chilled (45–60 minutes from frozen), until piping hot in the centre.
- Remove the foil for the last 5 minutes if you want the top crisp again.
In the microwave (quickest for a portion)
- Place a portion on a microwave-safe plate and cover loosely.
- Heat in short bursts, checking the middle, until steaming hot throughout.
Food safety: Lasagne is dense, so the middle takes longest — check it's piping hot all the way through before serving. Reheat once only, and don't leave it sitting warm.