First, on medium heat place oil, garlic, onions, oregano, and red pepper flakes in large pan. Stir and cook for a minute until onions translucent.
Next, raise heat to medium high and add tomatoes, salt and pepper. Stir and cook until tomatoes burst. This takes 3-5 minutes.
Now, add pasta, pasta water, butter, and red wine vinegar to the pan. Mix for a minute to combine all the flavors.
Finally, turn off heat and add feta and dill. Happy pasta eating!