Grind nuts in food processor into fine crumbs then combine with breadcrumbs in shallow dish. Line up 2 more dishes with flour and eggs alongside the breadcrumbs. Season cutlets with salt and pepper and coat in flour, egg then breadcrumbs.
Heat a shallow layer of oil in a large skillet over medium high heat. Preheat oven to 275F and place a metal cooling rack over a baking sheet.
Fry cutlets until golden brown in small batches, 2-3 minutes on each side. Place finished cutlets on the baking sheet and keep warm in the oven.
Melt butter in a small saucepan over medium heat. Add shallots and cook 2-3 minutes. Add flour and whisk 1 minute; whisk in wine and reduce 1 minute. Stir in blackberries and stock, season with salt and pepper, and cook to thicken.
Combine herbs and chop.
Place schnitzel on rolls slathered with some pinot blackberry gravy. Arrange a few pickles on top of the schnitzel, sprinkle with chopped herbs and set bun top in place.