To begin, make the broccoli pesto. First, blanch your broccoli. Add several ice cubes to a large bowl and fill 3/4 of the way with water and set aside. Then, bring a pot of salted water to a boil. Once boiling, add the broccoli for 1-2 minutes, or until broccoli turns bright green. Once the broccoli is bright green, remove with a slotted spoon and add to the ice water bowl to cool. After about 5 minutes, drain the broccoli and pat dry with a clean towel.
Add the blanched broccoli to a food processor with all of the other pesto ingredients and pulse on high until a pesto texture is formed. Let sit for about 5 minutes, then taste and adjust seasonings if necessary.
After you've made the pesto, make the dressing. Add 1/2 cup of the broccoli pesto, with mustard, red wine vinegar, salt, and pepper to a bowl and stir until everything is incorporated. Set aside.
Then, rinse the beans. Gently pat the beans with a clean towel to remove any excess moisture.
Add the beans to a large bowl, with the chopped scallions and chopped parsley. Add in the pesto dressing, and mix well.
Taste, and adjust seasonings to your preference.
Enjoy!