Ingredients

• 1 tablespoon olive oil or canola oil
• 1 1/2 pounds well-marbled steaks, such as hangar or flank
• Salt and ground black pepper
• 1/2 cup sour cream
• 2 tablespoons mayonnaise
• 1/3 cup buttermilk
• 1 small shallot, finely chopped or grated
• 1 garlic clove, grated or pasted
• 1 teaspoon Dijon mustard
• Juice of 1/2 lemon
• 1 tablespoon chopped fresh dill
• 1 tablespoon chopped fresh flat-leaf parsley
• Few dashes hot sauce
• 2 ounces blue cheese, crumbled as needed
• Salt and ground black pepper
• 1 large head romaine, roughly chopped
• 1/2 pint cherry tomatoes, halved
• 4 to 5 radishes, coarsely chopped
• 1 ripe avocado, pitted and chopped

Instructions

1. Place a heavy-bottomed skillet or a cast-iron skillet over medium heat with the oil. Season steaks liberally with salt and pepper, and cook to desired doneness, turning once, about 5 minutes per side for medium (for a steak that is 1-inch thick). Let steaks rest for 10 minutes before slicing.
2. While steaks are cooking, prepare dressing: In a large mixing bowl, whisk together all ingredients for dressing, and adjust seasoning as needed with salt, pepper and more lemon juice.
3. To serve, toss lettuce, tomatoes, radishes and avocado with prepared dressing, then divide among serving plates. Thinly slice steaks and top each salad.