sour cream
mayonnaise
chopped fresh cilantro
to 2 teaspoons prepared wasabi paste
garlic clove, grated
kosher salt, plus more to taste
Black pepper, to taste
pounds sirloin steak (about 1 inch thick)
Olive oil, for drizzling
kosher salt
Black pepper, to taste
ciabatta rolls, split open
sliced havarti or Swiss cheese
baby arugula
Potato chips, for serving