Steak House Chopped Salad

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1 tablespoon olive oil or canola oil

1 1/2 pounds well-marbled steaks, such as hangar or flank

Salt and ground black pepper

For the dressing:

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