That's huckleberry preserves, but blackberry would work just as well.
Recipe for about a dozen biscuits (depending on how thick you roll them out)
1 cup sourdough starter
1/4 cup butter
Mix barely melted butter with the starter
In a separate bowl mix:
1 cup all purpose unbleached white flour
1/2 tsp salt
1 tsp baking powder
1 1/2 tsp sugar
Blend that into your butter/starter mix and mix until it becomes a soft dough. Knead a bit on a lightly floured surface, then roll out and cut out your biscuits. Brush the tops with melted butter. Let em rest while the oven heats up, then bake on a greased sheet at 425 for 15 minutes or until golden brown on top.
Eat as many as you like but do try to stop before something inside explodes!