Place the pastry in a greased, lined quiche pan and cut off the overhanging edges. Use the off-cuts to fill the gaps in the sides of the pastry if needed. You can use a pre-made pastry shell or make your own if desired.
Heat oil in frypan over medium heat.
Cook onion for 10 minutes until very soft.
Add the balsamic vinegar and brown sugar and cook, stirring for 5 minutes, until caramelised.
Reduce oven temperature to 160˚C or 140˚C fan-forced.
In a medium bowl, mix together the cream, eggs, cheese, thyme. Season with salt and pepper.
Spread caramelised onion over puff pastry.
Remove skins from sausages and break meat into pieces. Scatter over onion.
Gently pour over egg mixture. Bake for 40-45 minutes until filling is set.
Nutritional information is an estimate and provided as a courtesy. The values may vary according to the ingredients and tools that are used. Please use your preferred nutritional calculator for more detailed information.