pre heat oven to 165° celsius
grease and line a 23cm square pan
melt chocolate and butter in a double boiler, then allow to cool for 20 minutes
in a small bowl, gently whisk the eggs, yolks and vanilla
in a large bowl, combine the sugar and salt
add the combined eggs and vanilla to the sugar and salt, then gently mix until just combined. Mixture will be grainy.
stir through the cooled chocolate and butter
sift the flour over the chocolate mixture, then gently fold through until just combined. Mixture will have lots of tiny lumps, which is fine.
Pour brownie batter into prepared pan
Drizzle the salted caramel sauce over the brownie batter, avoiding the edges of the pan. Use a chopstick to swirl the caramel through the batter.
Bake at 165°/330°F/155° FF for 40 minutes
Allow to cool in the pan, before cutting into 16 squares and drizzling with the remaining caramel