Bring about an inch of water to a simmer in your saucepan. Set the heatproof bowl in the mouth of the pot, making sure the water doesn't touch the bottom of the bowl. Add chocolate, butter and sugar, stir occasionally as it softens. Meanwhile dissolve the coffee on the hot water and add it to the chocolate butter mix. Stir until well combined. When all the sugar have melted remove bowl from heat.
Pre-heat the oven at 300 F or 150 C.
Add the milk, this will help decrease the temperature of the chocolate, mix with a hand mixer, the one by one add the eggs, mixing well before adding the following egg. Then add the vegetable oil. Sift all the dry ingredients together, then add onto the liquid and mix until well combined.
Lined your baking mold with parchment paper, add the chocolate mix and bake for two hours.