Preheat oven to 325F. Butter 8 or 9 inch spring-form pan and dust with cocoa, set aside.
In pan over low heat, melt together butter and Chocolate Chips until smooth. Do not let burn, cook low and slow. Set aside and cool slightly.
In large mixing bowl, mix together Brown Sugar, Ground Almonds and Salt.
Sift in Cocoa and Flour and mix well with a fork.
Add in Eggs beating in til combined.
Mix in Mayonnaise.
Pour in cooled, melted Chocolate and mix well. Mixture will thicken after a minute.
Fold in the 1/3 cup of Fudge chunks.
In prepared pan, pour in batter and spread out evenly.
Top the cake with the remaining 1/4 cup of Fudge chunks, partially pushing the Fudge halfway down into the batter.
Bake in preheated 325F oven for 30 - 35 minutes, depending on your oven.
Cool for 10 minutes. Remove spring-form ring and and carefully transfer to serving plate, (removing bottom of spring-form as you transfer it over).
Sift/Dust with remaining 1 Tbls Cocoa Powder over top. Serve with Ice Cream or Whipped Cream. Top with fruit if desired.