Using a blender or immersion blender, add all ingredients except olive oil and blend until smooth. Slowly drizzle int he olive oil and continue to blend until incorporated.
For the Flank Steak:
Preheat grill to high heat
Remove steak from fridge 20 minutes prior to cooking to allow it to come to room temperature
Drizzle steak with olive oil on both sides and season generously with kosher salt and freshly cracked pepper
Place steak on grill and cook until golden brown and slightly charred - about 4-5 minutes on each side
Remove steak from grill and allow to rest for 10 minutes.
While steak is resting, toss arugula, tomatoes, avocado and gorgonzola crumbles in a bowl with the balsamic.
Slice the steak into thin pieces going against the grain and place on top of salad.
Recipe by Good Thyme Kitchen at https://www.goodthymekitchen.com/grilled-flank-steak-arugula-salad/