Whole Wheat Penne in Cauliflower Sauce

I have never come across the use of the cauliflower in Italian dishes except for Pasta Primavera or Minestrone, so when Rachel Ray of 30 Minute Meals said on her show that she was making Pasta in Cauliflower sauce, it held my interest. The recipe was easy with just a couple of ingredients and I wanted to try it for myself to see if it was as good as she had said it would be ... it was :)
This is a very healthy Pasta dish, made with whole wheat Penne, garlic, onion, rosemary and cauliflower. Try it out and I am very sure you will enjoy it as much as K and I did.

12 oz whole wheat Penne Rigate
1 medium cauliflower, washed and cut into florets
1 red onion, chopped
3 cloves garlic, finely chopped
1 tbsp dried rosemary
1 cup stock (I used a cup of the Pasta water)
3/4 cup grated Parmesan or Romano cheese (I didn't use any)
1/2 tsp black pepper
Salt to taste
Extra Virgin Olive Oil

Boil water in a large pot. Add salt and the penne and cook till done. Remove 2 ladleful of the pasta water (if also using stock or else remove 3 ladlefuls), drain the pasta and keep aside.

Heat oil in a deep bottomed pan and add the chopped garlic. Cook for a couple of minutes and add the chopped onion. Cook till the onion turns tranlucent. Add the cauliflower florets, stock / pasta water and rosemary. Cover and cook till the florets are cooked. Add salt and pepper and mash the cauliflower. Add the reserved pasta water and the Penne. Mix well. Now add the grated cheese and toss the pasta to combine. Serve hot and enjoy !