Combine bread flour and plain flour in a small mixing bowl.
Microwave for 4 min on 500-600w taking the bowl out and stir in order to brown evenly. Set it aside.
Heat 1.5 tbsp olive oil in an instant pot and add onion, carrot and celery.
Set the instant pot to "saute" for 30 min to brown the vegetables.*3
When the vegetables are browned (at about 15-20 min in) add browned flour and 1/4 cup of olive oil.
Stir all constantly when all mixed well add pasata sauce and water.
In a separate frying pan, heat 1.5 tbsp olive oil and cook ground beef.
When the ground beef is cooked add red wine to the frying pan and bring it to boil.
Turn the heat off and add the ground beef and red wine into the instant pot.
Put instant pot lid on and set pressure cooker for 30 min on high. *4
When the 30 min pressure cooker cycle end, release the pressure.
Using a sieve, drain and separate the liquid sauce into a pot. Make sure all the liquid is squeezed out by pressing the solid against the sieve.
Bring the sauce simmer over medium heat, and keep shimmering to reduce the sauce by half. *5
If it is not used straight away, divide it into 500ml batches in ziplock bags and refrigerate or freeze for later use.
Notes
*1 It can be replaced with Tomato juice if you can not access to Pasata sauce*2 Any red wine is good. I used sweet red wine because I like sweetness in the demi glace sauce. *3 If you don't have an Instant Pot, use a frying pan and brown the vegetables. *4 If you don't have an Instant Pot, simmer the sauce about 3-4 hours. *5 It took about 1 hour to simmer on low heat.