Rye kaiser rolls

Poolish

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

Dough

• 200 g water
• 2 tsp dried instant yeast
• 300 g baker's flour, plus extra to dust
• 100 g rye flour
• 20 g unsalted butter
• 2 tsp sea salt
• 3 tsp barley malt powder (see Tip)
• 2 tsp molasses
• extra virgin olive oil, to grease
• milk, to brush
• caraway seeds, to sprinkle (optional)