Creamy Cauliflower Sauce for Pasta

Creamy cheesy pasta with no hint of cauliflower makes this pasta a must-try for the picky set.  Add color with fresh spinach and other vegetables to this delicious pasta if your family is less finicky.  The secret to its creaminess is blenderized cooked cauliflower, Romano cheese, and the water used to cook the pasta.  The flavor is subtle, but good and satisfying.  No one would guess that it's healthy.  
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Ingredients

12-oz. box high fiber pasta 1 tsp extra-virgin olive oil or an olive oil mister 3 to 4 cloves garlic, crushed 1 large onion, coarsely chopped 5 cups cauliflower florets, broken in half 2 cups reserved pasta cooking water 1 tbsp chicken or vegetarian soup base (Better Than Bouillon Reduced Sodium) 2 tbsp fresh rosemary, leaves stripped (about 4 sprigs) 1/8 -1/4 tsp cayenne pepper (or to taste) 2 -2 1/4 cups freshly grated Romano, plus some extra for garnish when serving Salt and black pepper to taste

Directions

1) Bring a large pot of water to a boil.  Add pasta and cook to al dente.  Drain and reserve about 2 cups of the pasta water, and return the drained pasta to the cooking pot; cover with the lid to keep it warm.
2) While the water is coming to a boil and the pasta is cooking, make the sauce.  Heat a deep skillet, oiled with the olive oil or sprayed with the olive oil mister, over medium heat.  Add the garlic and cook for 1 to 2 minutes, and then add the onions and cook for about 5 more minutes.
3) While the onion cooks, break up the cauliflower to about half-floret size pieces.  Put the cooked onion and garlic mixture in a blender to hold.  Add the cauliflower to the skillet, along with the stock and the rosemary leaves (no need to cut).  Cover the skillet and cook over medium high for 5 minutes until tender but firm.
4) Add contents of the skillet to the blender containing the onion mixture.  Add 1/1/4 cups of the reserved pasta cooking water to the blender.   Add a pinch of cayenne pepper. Carefully blenderize the contents on a slow setting at first with a towel over the lid,  since it is hot and it could spray everywhere.  Blend until completely smooth.  Use extra reserved pasta water to thin if necessary; otherwise discard the excess.
5) Add freshly grated cheese and cauliflower sauce to the warm reserved pasta in the pot and toss to combine.  Add vegetables or fresh baby spinach as desired.  Season with salt and pepper to taste if needed.  Top with freshly grated Romano cheese and serve hot.