To sauté the beef and onions, set the Instant Pot to the Sauté setting. Add two tablespoons of rice bran oil and one tablespoon of roasted sesame oil. Once hot, add 500 grams of beef chunks and sear on all sides until browned, approximately 5-7 minutes. Add the rice flour and stir; it's normal for the mixture to stick to the bottom of the pot.
To sauté the aromatics, add the chopped onions and minced garlic to the same pot. Cook until they are softened and aromatic, which should take about 2-3 minutes. If necessary, an additional tablespoon of rice bran oil can be added.
Add the vegetables: Place the sliced carrots, root celery, and diced potatoes into the Instant Pot. Stir them for a few minutes to ensure they are well-coated with the oil and aromatics.
Add the red wine and cook for 5 minutes.
To deglaze the pot, pour 500ml of homemade broth to scrape up all the browned bits from the bottom for added flavour. Then, season the mixture by stirring in rosemary and oregano, along with thesalt and black pepper.
Add the drained butter beans and stir well to ensure the beef and vegetables are thoroughly mixed.
To cook under pressure: Secure the Instant Pot's lid and ensure the valve is set to "Sealing." Choose the Pressure Cook or Manual option and set it to cook on high pressure for 25 minutes. After the cooking cycle ends, wait for a 10-minute natural release, then proceed with a quick release to expel any residual pressure.
To serve, ladle the stew into bowls and, if desired, garnish with fresh parsley. Enjoy hot, accompanied by your favourite gluten-free bread, or savour it by itself for a hearty and fulfilling meal.