Traditional Kaiser rolls

Poolish

• 100 g water
• 1 pinch dried instant yeast
• 100 g baker's flour

Dough

• 200 g water
• 2 tsp dried instant yeast
• 400 g baker's flour, plus extra to dust
• 20 g unsalted butter
• 2 tsp sea salt
• 3 tsp barley malt powder (see Tips)
• extra virgin olive oil, to grease
• milk, to brush