Heat oil in a pan over medium heat.
Cut head of broccoli into bite size florets and pieces (don't throw away the stem-- cut into bite size pieces and cook with florets).
Add broccoli to the pan along with water. Cover and cook for 5 minutes, stirring occasionally to ensure that broccoli is cooked evenly.
Reduce heat to low and add ¼-½ c pesto, as desired, stirring constantly to coat the broccoli. If using pesto from the fridge, it may be a little too thick to mix in with the broccoli. Add chicken broth 1 tbsp at a time to thin it out.
Once broccoli is coated, add parmesan cheese and mix until incorporated.
Serve immediately. Enjoy!