Heat the 3 tablespoons of olive oil in an oven proof pan and saute the onions and garlic until softened.
Add the tomatoes, peppers and zucchini and basil. Season with pepper.
Add in the ¼ cup of olive oil, stirring well to incorporate all the ingredients.
Reduce the heat and cook the vegetables for 5 minutes.
Remove the pan from the heat and stir in the orzo.
Fill the pan with the hot water and stir.
Place the pan in the oven and bake for 45 minutes.
Check the pan often, stirring so that the orzo does not stick to the bottom of the pan. If the orzo mixture becomes too dry, add in more hot water and stir.
Shortly before the end of the cooking time, top the orzo with feta cheese and bake for a few more minutes. Serve straight from the baking dish.