In a large bowl, whip the cold heavy cream until medium-stiff peaks form.
Add the sweetened condensed milk and vanilla extract, then gently fold to combine, being careful not to deflate the whipped cream.
Dissolve the instant coffee in 2 tablespoons of hot water, then stir into the ice cream base.
Melt the dark chocolate over a double boiler, then stir in the coconut oil until smooth and liquid.
Line a loaf pan with parchment paper, then spread a layer of the coffee ice cream mixture evenly into the pan.
Pour a thin layer of melted chocolate over the ice cream layer, and place in the freezer for 10 minutes to set.
Repeat the layering process until all of the ice cream mixture and chocolate have been used. Ensure the final layer is chocolate.
Freeze for at least 4 hours, or until completely solid.
Before serving, let stand at room temperature for a few minutes. Slice and sprinkle with cocoa powder and ground coffee.
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