Mushrooms, Leek and Bell Pepper - Three's a Company

"Three's a company" - and here we have mushrooms, leek, and bell pepper. Generally, when we sauté leek, we don't need to add onions, as the taste will be similar.
This makes a great filling for everything - risotto, pasta, pierogi, roasted potatoes or sweet potatoes. Don't skimp on good fat here, butter or a good olive oil is a must in this case!