Spread out the pitted cherries in an even layer on the baking sheet and drizzle with oil, honey, amaretto, and a pinch of salt. Toss well to coat evenly. Bake for 15-20 minutes, stirring a few times until their juices start to come out. Set aside.
For the Dutch baby
Place butter in a 10-inch cast-iron skillet and place the skillet in the hot oven (keep it at the same temperature as the cherries). Next, blend all the Dutch baby ingredients in a blender while the skillet is getting hot. Blend until smooth.
Remove the skillet from the oven and quickly pour in the batter. (Careful not to splatter yourself!) Return the skillet to the oven and bake for 15-20 minutes. Be sure not to open the oven door, as the Dutch baby might not rise properly. Lower the heat to 300° F and continue baking for another 3-5 minutes.
Whipped marionberry cream
While the Dutch baby is in the oven, beat the cream using a hand or stand mixer until soft peaks form. Add the marionberry jam, sugar, and vanilla, and beat again until incorporated. Store in the fridge until serving.
To serve
Remove the skillet from the oven. Garnish the Dutch baby with fresh sliced peaches, roasted cherries, and the sauce from the pan. Add a dollop of the whipped cream, and pour over some honey and blueberry syrup. Dust with powdered sugar and a squeeze of lemon.