Stuff each date generously with peanut butter.
Using a medium pan, roast the peanuts for 2 to 5 minutes over medium heat. Chop them using a small blender or a mortar and add some salt flakes (3 pinches).
In the meantime, place the chocolate pieces (40 gr.) in a small heatproof bowl that fits in a small saucepan (for bain-marie). Half fill the saucepan with water, place bowl on top and bring to a simmer. Make sure the water does not touch the chocolate. Then mix regularly the chocolate with a metal spoon. Once the water starts to boil, reduce the heat and continue mixing until fully smooth.
Using the same metal spoon, drizzle the melted chocolate over the dates (until the top of each date is fully coated). Then, sprinkle with salty roasted peanuts.
Refrigerate until the chocolate has fully hardened (for approximately 30 minutes). You can keep it in the fridge up to 1-2 weeks.