Preparation: Feed your sourdough starter at a 1:1:1 ratio if you want to bake the same day. Feed with a 1:5:5 ratio if you want to leave it overnight. It should be active and bubbly, and doubled in size.
This sourdough loaf has a tangy, earthy, subtle flavor thanks to the beetroot powder and thyme leaves, and gives a deeper color than using fresh beets. This is a high-hydration dough, which allows the beautiful red beet color to remain after baking, but it can feel messy and difficult to handle at the beginning of the stretch and folds. It will eventually come together into a sticky ball. Use wet or lightly oiled hands to prevent sticking, and a bench/bowl scraper can help with moving it around.