Put the onion wedges in an ovenproof dish with 1 tbsp of olive oil. Season with salt.
Roast the onions in the oven or in an Airfryer for 15-20 minutes at 180C until they are soft and just starting to turn golden.
Put 1 tbsp of cornflour in a heatproof jug or bowl and add 2 tbsp of cold water.
Crumble the stock cube into the jug and fill up to 500ml with boiling water, stirring.
Put the roasted onions, and stock into the Froothie Evolve Blender with the thyme, sugar and butter (if using).
Activate the Froothie Evolve with voice control “Hey Froothie, make my sauce” or use the manual settings for sauces.
When the cycle is complete, pour the gravy into a serving jug.
If you have a different power blender, start by pulsing the ingredients for three or four pulses, then blend for 3 minutes.
This recipe makes a smooth pourable Onion Gravy. If you like more onion pieces in your gravy. Slice or chop one additional onion and sauté until soft. Stir into the sauce once the blending process is finished.