Heat your oven to 180°C or 300°F
Place a frying pan on a medium heat and add the olive oil
Add the red onion, brown sugar and balsamic vinegar and gently fry for 5 minutes.
Add the red peppers and continue to gently fry on a low heat with the lid on for 25 minutes until soft
Meanwhile, grease a 25cm pie dish with butter (note 1)
Add the pine nuts to a small pan and toast on a medium to high heat for a few minutes until they start to brown (note 2)
Beat the eggs into a bowl or pyrex jug and add the milk, salt and pepper and continue to beat with a fork until incorporated
When the onions and peppers are cooked spoon them into the pie dish
Pour on the milk and egg mixture
Top with the goat's cheese slices and pine nuts
Bake in the oven for 30 minutes (note 3)