Cut the zucchinis in 1-inch chunks, put them in a pot, cover with water and boil over medium heat.
Once the zucchinis are very tender (around 15 min), drain them and put them back in the pot. Return the pot to the heat and start mashing them (you can do that with a fork or a potato masher), some water will get out of them, boil them for few minutes until the water evaporates.
Add the rest of the ingredients and stir.
You can be creative and add other flavorings such as garlic or other spices.