Coffee-walnut Toffee

• 2 instant espresso powder
• 240 gr coarsely walnuts (chopped)
• 200 gr sugar
• 170 gr butter (unsalted)
• 140 gr bittersweet chocolate
• 80 ml water
• 75 gr packed golden brown sugar
• 16 ml dark unsulfered molasses
• 1 gr cinnamon (ground)
• 1 gr salt