Marinate the thinly sliced meat for 15-20 minutes in the bi carb soda, olive oil, salt and pepper
In a large pan or pot add in one tablespoon of olive oil and sear off the meat in batches, making sure not to crowd the pot. Once cooked, remove the meat from the pot and set aside
Next add in another tablespoon of olive oil and fry the sliced onions and garlic. Cook for roughly five minutes until softened, then add your mushrooms and cook for a further three minutes
Add the spelt flour and cook for another two minutes
Pour in the broth and the cooked meat, and once it thickens, add in mustard and sour cream stirring gently
Season with salt and pepper to taste and serve with pasta, rice or potatoesÂ