Standard pasta sauce that I like to make when I'm in a hurry and want some spaghetti or something simple for dinner.
Add a few tablespoons of olive oil to a large saute pan or skillet, turn heat to medium-low
Add the onion, and cook until translucent, salting the onions slightly to help draw out their moisture
Add the mushrooms to the pan, cook for 3-5 minutes with the onions
Add the garlic and as much crushed pepper as you're comfortable with, and saute for another 1-2 minutes
Add the tomatoes to the pan, adjust the heat to low and stir to mix everything together
Cook the sauce until it's simmering, and season with salt and Italian seasoning blend to taste
Serve with pasta or store in a sealed container in the fridge and use it later