Preheat the oven
to 350°F/180°C/gas 4. Butter two 12-cup mini
muffin pans.
Sift the all-purpose and buckwheat
flours, cocoa, baking powder, and salt into a medium
bowl. Stir in the almonds.
Beat the butter and
brown sugar in a large bowl with an electric mixer
at high speed until creamy. Add the eggs, milk,
and vanilla, beating until just blended.
Mix in
the dry ingredients and semisweet chocolate. Fit a
pastry bag with a plain 1/2-inch (1-cm) tip.
Fill
the pastry bag, twist the opening tightly closed,
and squeeze out small rounds into each prepared cup.
Bake for 20-25 minutes, or until lightly browned
and a toothpick inserted in the centers comes out
clean. Cool in the pans for 3 minutes. Transfer to
racks and let cool completely.
Melt the white
chocolate in a double boiler over barely simmering
water. Spoon the chocolate into a small freezer bag
and cut off a tiny corner.
Pipe chocolate lines over
the tops in a decorative manner. Let set for 30
minutes. Transfer to racks to finish cooling.