Bring milk and honey to the boil, then let it cool down for about 10 minutes. Cream eggs, honey milk, sugar and 1 pinch of salt with the whisk of the mixer. Whip the mixture in a hot water bath (see tip) with the whisks until it becomes thick and creamy. Let it cool down and stir more often. Stir in orange zest.
Sort the blackberries, rinse if necessary, drain and puree finely with a hand blender. Whip the cream until stiff. Line an ovenproof dish (approx. 18 x 26 cm; approx. 1.3 l capacity) with parchment paper. Fold the cream into the cooled down egg mixture. Pour parfait mixture into the casserole dish. Spread blackberry puree in patches on top and fold in with a spoon to create a strudel pattern. Cover with foil and place in the freezer for 8-10 hours.