IMPROOFED SOURDOUGH is a bakery at 448 Bright Hill Dr, Bishan, Singapore, and its name says it specialises in sourdough. It holds a perfect 5.0 Google rating from 30 reviews.
Sourdough is made with a live starter of flour and water rather than commercial yeast, and the long, slow fermentation gives it a tangy flavour, a chewy crumb and a crisp, blistered crust. A good loaf has an open, uneven crumb, a deep golden crust and a clean, slightly sour taste, not a harsh one. Sourdough keeps better than most bread, often for several days, but it is best stored in a paper bag or cloth at room temperature rather than the fridge, and Singapore's humidity means it is wise to eat or freeze it within a few days. Small bakeries often bake in limited batches, so popular loaves can sell out early, and regulars check whether they can order ahead. Mention any allergies, as sourdough still contains gluten.
For anyone in Bishan, IMPROOFED SOURDOUGH on Bright Hill Drive is a very highly rated place to pick up a loaf.