tart shell. Fill the tart with
the flan mixture four-fifths
of the way, leaving a rim
of crust still exposed. Bake
for 20 minutes and pull
out of the oven.
4 Sprinkle on a generous
layer of baked hazelnut
streusel and return to the
oven. Bake for another 20
to 30 minutes, until the
tart is set and the crumble