While you're preparing ingredients, get a head start on the biscuit dough since it needs minimal mixing. In a medium bowl, whisk together the flour, baking powder, salt, sugar, and cinnamon. Cut the cold butter into small cubes and add to the dry mixture. Using your fingertips or a pastry cutter, work the butter into the flour until the mixture resembles coarse breadcrumbs with some pea-sized pieces of butter remaining—this creates the flaky texture in the finished dumplings. Stir in the milk until just combined into a shaggy, sticky dough; don't overmix or the biscuits will be tough. Set the dough aside. Meanwhile, hull and slice the strawberries into 1/2-inch thick pieces, trim the rhubarb and cut it into 1/2-inch slices, and squeeze fresh lemon juice into a small bowl.

Add the sliced strawberries and rhubarb to a large, heavy-bottomed pot or Dutch oven with the sugar, lemon juice, water, and vanilla extract. Stir well to combine and dissolve the sugar slightly. Place the pot over medium-high heat and bring the mixture to a gentle boil, stirring occasionally to help the fruit release its juices and ensure even cooking. Once boiling, reduce the heat to medium-low and let it simmer for about 5 minutes. I like to taste the fruit at this point—the acidity from the rhubarb should be balanced by the strawberry sweetness and lemon juice, creating a bright filling that won't be too tart.

Using a large spoon or ice cream scoop, drop spoonfuls of the biscuit dough from Step 1 directly onto the simmering fruit mixture, spacing them about an inch apart—they'll expand slightly as they cook. Cover the pot with a lid (or use foil if you don't have one that fits) and reduce the heat to medium-low to maintain a gentle simmer. Let the grunts cook for about 15 minutes without lifting the lid, as the steam is essential for cooking the dumplings through. I find that keeping the heat steady and consistent prevents the bottom from scorching while the tops stay moist and tender.

After 15 minutes, carefully remove the lid and check if the biscuits are cooked through by inserting a toothpick into one of the larger dumplings—it should come out clean or with just a few moist crumbs, not wet batter. If the toothpicks shows wet batter, cover and simmer for another 2-3 minutes. The fruit should be bubbling gently around the edges, and the biscuits should be set and lightly golden on top. Serve the strawberry rhubarb grunt warm in bowls, spooning both the biscuits and the berry sauce into each serving.

Divide the warm grunt between serving bowls, making sure each bowl has a generous portion of both biscuits and fruit sauce. Top with softly whipped cream, vanilla ice cream, or a dollop of crème fraîche if desired. The warmth of the grunt will soften ice cream beautifully while the cool creaminess balances the tart fruit.