Add into the warm broth the mustard along with the coriander and oregano and mix well. Keep aside.
Place a large pot or casserole (with lid) on medium-high heat and pour 2 tbsp of oil. A minute later add the pork fillet and sear both of its sides until nicely browned. Remove from the pot and keep aside covered.
In the same pot pour the remaining oil and add the onions along with the garlic and sauté for 2-3’.
Add the beans, passata and pour the vegetable broth. Mix well and simmer with the lid on for 45’ while gently stirring every 15’.
Then add the pork, pour the lemon juice and season with the salt and pepper. Continue cooking for 30’.