Skip the blender and make bearnaise the classic way, wilt the kale in the steak pan while it’s resting and give it a quick toss before serving. Two pans, two bowls, a small dish for the tarragon, a whisk and a pair of tongs. Put a bit a water in the hot pans while you eat to soften anything left in them. An immersion blender is a good compromise for sauces like this too, I find them easier to clean than a pitcher. Either way it should take no more than five minutes to tidy up after. (You can also make the bearnaise first and hold it in a warm oven, it’ll be fine)
Skip the blender and make bearnaise the classic way, wilt the kale in the steak pan while it’s resting and give it a quick toss before serving. Two pans, two bowls, a small dish for the tarragon, a whisk and a pair of tongs. Put a bit a water in the hot pans while you eat to soften anything left in them. An immersion blender is a good compromise for sauces like this too, I find them easier to clean than a pitcher. Either way it should take no more than five minutes to tidy up after. (You can also make the bearnaise first and hold it in a warm oven, it’ll be fine)