Put lemon juice into a liquid measuring cup and add heavy whipping cream to the 1 cup mark. Let stand for a few minutes to make soured cream.
Heat oven to 425°F. Arrange oven rack to upper third position. Line a baking sheet with parchment paper; set aside.
In a food processor, add flour, sugar, salt, baking powder, and baking soda and blend briefly. Add butter and pulse to make coarse mixture. Turn out mixture to a large bowl and make a well in the center. Add egg, vanilla extract, and enough soured cream to make a soft but firm dough. Gently fold in blackberries and blueberries.
Turn out dough to lightly floured surface and knead briefly to make a firm dough. Pat out dough into 1-inch thick circle. Cut dough into wedges or rounds and place on prepared baking sheet. Brush each scone with milk or cream.
Bake 16 to 19 minutes or until scones are nicely browned.
While scones are baking, make the glaze by heating honey and butter in a liquid measuring cup until melted mixture is simmering (about 1-1/2 minutes). Brush scones with honey-butter glaze as they come out of the oven. Let scones cool for about 15 minutes before brushing on honey-butter glaze once more. Since these scones are so moist, I recommend storing them in the fridge and reheating until warm.
Notes
I used 1 cup of frozen blackberries and omitted the blueberries only because I had a lot of blackberries to use up. I think it was tasty using only blackberries, but I think I would have liked the combo of the two as well.I sprinkled a bit of sugar crystals on after the glaze to give it a little sparkle, but this is optional.These scones are extremely moist. At first I kept my scones covered in a Tupperware on the counter top but this led to the scones almost being too moist, so I transferred them to the fridge and reheated when someone was ready to eat one.As seen in one of the photos, I had a honey butter compound that was not melted and used that on the scones. This would be a great alternative to the glaze if you wanted to avoid the stickiness factor.Recipe from Life’s Simple Measures.