1Begin by crushing the digestive biscuits into fine crumbs. You can do this by placing them in a plastic bag and using a rolling pin or by using a food processor.
Melt the unsalted butter in a small saucepan over low heat or in the microwave. Combine the melted butter with the biscuit crumbs and mix until well combined.
Press the biscuit mixture into the base of a tart pan, ensuring it is evenly distributed and compact. Place the tart base in the refrigerator to set while you prepare the ganache.
Chop the dark chocolate into small pieces and place them in a heatproof bowl.
In a small saucepan, heat the heavy cream over medium heat until it just begins to simmer. Do not let it boil.
Pour the hot cream over the chopped chocolate and let it sit for a minute to melt the chocolate.
Stir the chocolate and cream together until you have a smooth, glossy ganache.
Pour the ganache over the chilled biscuit base, spreading it evenly with a spatula.
Refrigerate the tart for at least 2 hours or until the ganache is set.
Once set, remove the tart from the refrigerator, slice, and serve. Enjoy your Dark Chocolate Ganache Tart!