What Is Sourdough, Really?

Sourdough is one of the oldest forms of bread-making in the world. Unlike commercial yeast breads that rely on packaged yeast for their rise, sourdough uses a starter — a live culture of wild yeast and bacteria that you cultivate yourself from just flour and water.

The result is a bread with a complex, slightly tangy flavour, a chewy crumb, and a crackling crust that you simply can't get from store-bought loaves. It also tends to be easier on digestion for many people, thanks to the long fermentation process.

The Three Things You Actually Need

Forget the long equipment lists. At its core, sourdough requires:

  1. A starter — your live fermented culture, which you build over about a week
  2. Flour, water, and salt — that's the bread itself
  3. Time — sourdough is not a fast process, and that's what makes it work

A Dutch oven (cast iron pot with a lid) is extremely helpful for baking — it traps steam, which gives you that bakery-style crust — but it's not strictly essential.

Building Your Starter

A sourdough starter is simply flour and water left to ferment, fed regularly until the wild yeast in the environment colonises it and makes it bubbly and active. Here's a simple process:

  • Day 1: Mix 50g wholemeal flour + 50g lukewarm water in a clean jar. Stir well. Cover loosely and leave at room temperature.
  • Days 2–7: Each day, discard about half of the starter, then feed it with 50g fresh flour and 50g water. Stir, cover, and leave.
  • Signs it's ready: Consistent bubbles, a tangy smell (like yoghurt or vinegar), and it should roughly double in size within a few hours of feeding.

Patience is everything here. Some starters take 5 days; some take 10. Temperature matters too — warmer kitchens speed things up.

The Basic Sourdough Process

Once your starter is active, here's the high-level flow of making a loaf:

  1. Mix: Combine your active starter, flour, water, and salt. Let it rest (autolyse) for 30–60 minutes.
  2. Stretch and fold: Over the next 3–4 hours, perform a series of gentle stretch-and-fold movements every 30 minutes. This builds the dough's structure without traditional kneading.
  3. Shape: After the bulk fermentation, gently shape your dough into a round (boule) or oval (batard) and place it in a floured proofing basket.
  4. Cold proof: Cover and refrigerate overnight (8–16 hours). This slows fermentation, deepens flavour, and makes the dough easier to score.
  5. Bake: Preheat your oven and Dutch oven to 250°C (480°F). Bake covered for 20 minutes, then uncovered for 20–25 minutes until deep golden brown.
  6. Rest: Let the loaf cool completely — at least 1 hour — before slicing. Cutting it too early affects the crumb.

Common Beginner Mistakes to Avoid

  • Using an under-ripe starter: Your starter must be consistently bubbly and active before you bake with it. A weak starter = a dense loaf.
  • Adding too much flour when shaping: A slightly sticky dough is normal. Too much extra flour disrupts the structure.
  • Not resting after baking: The crumb continues to set as the bread cools. Slicing too soon gives you a gummy interior.
  • Over-proofing: More time isn't always better. If the dough is over-fermented, it won't hold its shape and will bake flat.

Keep Going — It Gets Easier

Your first loaf might not look like something from a bakery window. That's completely normal. Every bake teaches you something new — about your starter, your oven, your kitchen temperature. Sourdough is a practice, not a recipe you perfect once and repeat identically. Stick with it and you'll be rewarded with some of the most satisfying cooking you'll ever do.