To make the batter, place the eggs in a mixing bowl with the milk, flour, dried herbs and salt. Whisk well until you have a smooth creamy batter - you can blitz this in a food processor if preferred. Chill for 30 minutes. Preheat the oven to 400F/200C/Gas mark 6. Toss the oil with the sausages, onion wedges and courgettes and spread into a large oven proof dish, cook in the oven for 10 minutes.
Carefully remove from the oven and pour the batter over, return to the oven for 30 to 35 minutes until well risen, puffed up and golden. Serve at once
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