Wrap the 4 potatoes in aluminum foil; place them on a baking tray on top of a bed of coarse salt; bake at 350°F for about 1 hour and 10 minutes. Let cool; in the meantime, mix 7 ounces of robiola cheese with 3 tablespoons of oil, herbs to taste, salt and pepper. Cut the potatoes open halfway and stuff with the robiola mixture and the caviar; garnish with fresh herbs to taste.