1. Preheat the oven to gas 7, 220°C. Put flour in bowl, season, and gradually whisk the eggs and milk to make a smooth batter. Stir in the sage and set aside.
2. Put the onions and pepper in a 22 x 28cm ovenproof baking dish and drizzle over the oil. Roast for 10mins, then add the sausages, tomatoes and peas and roast for a further 10 mins. Remove from the oven, pour over the batter and cook for a further 30-35 mins until puffed and golden.
3. Meanwhile, stream the broccoli for 5-6 mins until tender. In a small pan, mix the gravy pot with 22ml cold water and bring to the boil, stirring constantly. Simmer for 1 min. Serve the toad in the hole with the broccoli and gravy.