Chocolate Swiss Roll Cake

INGREDIENTS

For the cake::

1 cup

semisweet chocolate chips

3 tbsp

strong coffee (or water)

large eggs, at room temperature, separated

2/3 cup

sugar

1/4 tsp

table salt

2 tbsp

unsweetened cocoa powder, divided

For the filling::

1 cup

heavy or whipping cream

2 tbsp

powdered sugar

1/2 tsp

vanilla extract

For the ganache::

4 oz

semisweet chocolate chips

1/2 cup

heavy cream