Preheat oven to 170 C.
Line 20 cm baking tin with parchment paper.
Melt chocolate and nuttelex in microwave or in a bowl over a simmering pot of water until melted and smooth. Let cool to room temperature
Whisk in eggs and tahini until combined
Whisk in flour, cocoa, espresso and salt until combined
Pour batter into prepared pan and bake in oven for 20-30 minutes until just set.
Let cool and cut brownies into squares. It makes 12 large brownies or 16 to 20 smaller ones.