The best chocolate Brownies

 Ingredients

• 125g butter, chopped
•  300g dark chocolate
•  1 1/4 cups caster sugar
•  3/4 cup plain flour, sifted
•  1/4 cup cocoa powder, sifted
•  1/2 cup chopped walnuts
•  3 eggs

Directions

1. Preheat oven to 160°C fan-forced. Grease a 6cm-deep, 20cm pan. Line base and side with baking paper.
2. Place butter and 200g chocolate in a large heatproof bowl. Pour water into a saucepan until one-third full. Bring to the boil over high heat. Reduce heat to low. Place bowl over saucepan (don’t let bowl touch water). Using a metal spoon, stir mixture for 3 minutes or until smooth and combined. Cool slightly.
3. Combine sugar, flour, cocoa, 2 tablespoons walnuts and two-thirds remaining chocolate in a large bowl. 
4. Add butter mixture and eggs. Stir to combine. 
5. Pour into prepared pan. Sprinkle with remaining walnuts and chocolate. 
6. Bake for 1 hour or until a skewer inserted in centre comes out with crumbs clinging. 
7. Cut portions when is still warm. Cool completely in pan.