Chocolate Brownie Milkshake

Brownies

• 3 ½ oz dark chocolate (50% cocoa), in pieces
  或 3 ½ oz semi-sweet chocolate, in pieces
• 1 ½ oz vegetable oil
• 3 oz whole milk, chilled
• 1 egg yolk, from large egg
• 3 oz sugar
• 2 oz all-purpose flour
• 1 oz cocoa powder
• 1 pinch salt

Milkshake

• 12 ½ oz whole milk, chilled
• 9 oz vanilla ice cream