Method :

Add coffee powder to the condensed milk .
Warm Slightly in a double boiler to dissolve the coffee and stir well.
Cool for 15 minutes.
Put 600gm of melted Dark Chocolate into mould.
Turn mould upside down to make hollow shells.
Cool shells in a refrigerator for 10 minutes.
Take shells out fill up with a coffee truffle mixture.
Top up the shells with the balance melted Dark Chocolate.
Cool in refrigerator for 15 minutes.
Tap each chocolate out lightly from the mould so that they do not break and serve.