Broccoli-Quinoa Salad With Buttermilk Dressing

Ingredients
Method
Whisk buttermilk, olive oil, vegetable oil, lemon zest, lemon juice, rice vinegar, pepper, and 1 tsp. sea salt in a medium bowl. Taste and season with more salt if needed.
Do Ahead: Dressing can be made 5 days ahead. Cover and chill.
Stir together shallot and 2 Tbsp. buttermilk dressing in a small bowl and set aside.
Cook broccoli in a large pot of boiling salted water until crisp-tender, about 1 minute. Using a slotted spoon, transfer broccoli to a bowl of ice water; let cool. Drain and place on a kitchen towel–lined baking sheet.
Meanwhile, return water in pot to a boil and cook quinoa until slightly al dente, about 12 minutes; drain. Toss quinoa and 2 Tbsp. buttermilk dressing in a large bowl to coat; season with salt. Let cool.
Add dressed shallot, broccoli, parsley, tarragon, pistachios, and 2 Tbsp. buttermilk dressing to quinoa and toss to combine. Season with more salt if needed.