Shoestring potatoes served with beef sliders on a potato bun

Ingredients

• 450 g potato flour
• 10 ml (2 tsp) xanthan gum
• 60 ml (¼ cup) milk
• 30 ml (2 tbsp) butter, melted and cooled
• 10 g sachet instant yeast
• 15 ml (1 tbsp) apple cider vinegar
• Pinch of cream of tartar
• Pinch of bicarbonate of soda
• 1 large egg white
• Salt, to taste
• 250 ml (1 cup) warm water, enough to form a dough
• 1 large egg mixed with milk, for brushing
• Sesame seeds, for sprinkling