This was my first experience cooking with broccolini! The following recipe is a close adaptation of a recipe from The Garden Grazer: http://www.thegardengrazer.com/2012/11/mac-n-cheese-with-broccoli.html
pasta of your choice
1-2 bunches of broccolini
3 tablespoons butter
½ onion, finely chopped
minced garlic (We used about 5 tiny cloves.)
3 tablespoons flour
2 ½ cups milk
1 teaspoon dry mustard
2 cups shredded cheddar
salt and pepper
Cook and drain the pasta as directed on the box. We used shells! Set aside.
Rinse the broccolini and chop into bite-sized pieces, including the thin, tender stems. Fill a pot with about one inch of water and bring it to a boil. Once boiling, throw in the broccolini, cover, and reduce heat to medium. Leave for 5 minutes, then drain and set aside.
Melt the butter in a pot over medium heat. Add the garlic and onion and cook for 4-5 minutes, stirring frequently. Turn the heat to low, then add the flour. Stir this mixture continuously for 1-2 minutes to avoid burning. Then stir in the milk and dry mustard and return the heat to medium. Let this cook, stirring occasionally, for 5-7 minutes, until the mixture becomes creamier and thickened. Add in the cheese and stir until the mixture is smooth and all of the cheese is melted.
Finally, stir in the pasta and broccolini and season with salt and pepper!