make espresso, add stevia and erythritol and stir until both have melted, reheating in microwave if necessary; set aside to cool then refrigerate.
roast almonds for 5 minutes, let them cool, then put them in a zip lock bag and break them up using a meat hammer or similar.
in a medium bowl, beat the mascarpone until soft, add coffee, coconut oil, coconut flour and almonds.
mix well, then rest in the fridge to set for a couple of hours.
remove from fridge, scoop some mix and form a ball by rolling it around between your palms (about the size of Ferrero Rocher).
mix cacao powder with Sukrin icing sugar and coat each truffle (small serving tongs make the job easier and neater).
transfer to a serving bowl or individual paper cups and store in the fridge in a sealed container.
Notes
Metric kitchen scales are an inexpensive yet invaluable gadget to enable accurate measurement of ingredients. Store them upright in a cupboard or over your worktop and they'll only take up a tiny bit of space. Click HERE for the ones I use in the UK. For U.S. option click HERE.