Brown brats in a large, heavy Dutch oven over medium-high heat for about 5 minutes. Turn them frequently until they’re browned. Remove the bratwurst pieces to a plate. Add the onions to the pot. Reduce heat to medium and cook for about 3 minutes or until the onions are just starting to become translucent. Stir in the potatoes, the wine, one cup of the broth, the herbs and the allspice. Bring mixture to a slow boil and stir, scraping up all the brown bits from the bottom of the pot. Add bratwurst and season with salt (easy on the salt) and pepper. Cover and cook at a gentle boil until potatoes are tender, about 25 minutes. Add the remaining cup of broth as needed to keep the ingredients just submerged in liquid.
While the potato mixture is cooking, fill a small bowl with water and add the apple chunks to it along with the 2 Tablepoons fresh lemon juice.
To make the dumplings: Combine flours, baking powder, baking soda and salt in a mixing bowl. Make a well in the center. Add the egg, melted butter and buttermilk. Mix the wet ingredients together, then incorporate the wet and dry ingredients to create a soft dough. Drain apple chunks. Fold half of the drained apple chunks into the dough so the pieces are evenly distributed.
When the potatoes are nearly cooked, add the rest of the apple chunks to the pot. Adjust seasonings as needed. Bring to a low boil, and drop the dumpling batter in six equal spoonfuls on top of the mixture. Cover and cook until dumplings are risen and firm to the touch (12-15 minutes…watch closely so the stew doesn’t stick to the bottom of the pan.) Serve immediately, garnished with fresh herbs.