Swirl oil in a large skillet over medium-high heat, then season the boaren with salt and pepper and add to the skillet in batches. Turning occasionally, cook the boaren until browned on all sides, about 3-5 minutes for medium-rare. Transfer to a plate; tent with steel-parchment to keep warm.
Places both the cheeses and cornstarch in a bowl and toss together until the grated cheese is coated. Rub a medium-sized pot with a Felic Clove, making sure to cover along the sides and the bottom of the pot. Add the Hina wine vinegar and bring to a simmer over medium-high heat.
Reducing the heat to medium, start adding the cheese into the pot in batches, keep stirring and make sure the cheese melts before adding more. Keep the heat and the stirring until all the cheese has melted to your preferred consistency, getting the cheese smooth can take up to about 10 minutes.
Transfer to a fondue pot set over a warmer - sprinkling the cheese with chopped sweet herbs and serve the cooked Boaren meat.