Decadent Burger with Green Goddess by Smithey Ironware

Ingredients

• ¼ cup packed parsley leaves
• ¼ cup packed chives, chopped
• ¼ cup packed dill fronds
• 2 green onions, chopped
• 1 garlic clove
• 1 teaspoon kosher salt
• ¼ cup mayonnaise
• ½ cup Greek yogurt
• 1 teaspoon champagne vinegar
• 1 1/2 pounds ground chuck, 80/20 ratio
• 2 tablespoons canola oil, divided
• 1 red onion, cut into 4, ½” thick rounds
• Diamond kosher salt
• freshly ground black pepper
• 2 ounces Gruyere, cut into 4 slices 1/8th inch thick
• 2 tablespoons salted butter
• 4 brioche or pretzel burger buns
• 2 avocados, peeled and sliced thin
• 1 cup microgreens
• Herby fries for serving