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Make a Sourdough Starter from Scratch

The most common mistake is giving up on day 3-4. Your starter will smell awful (like acetone or vomit) around day 3 — this is normal. Bad bacteria die off and wild yeast takes over by day 5-7. Do not throw it out.

What You Actually Need

Just two ingredients: flour and water. That's it. Wild yeast and bacteria are already on your flour and in your kitchen air — you're just creating the right conditions for them to thrive.

Day-by-Day Method

  1. Day 1: Mix 50g whole wheat or rye flour + 50g room-temperature filtered (or tap water left out 1 hour to off-gas chlorine). Stir vigorously. Cover loosely (not airtight). Leave at room temperature (ideally 21-24°C).
  2. Day 2: You may see nothing. Discard half (50g), add 50g flour + 50g water. Stir well.
  3. Day 3-4: Smells bad, possibly bubbling a little. This is normal. Discard half, feed again same ratio. The discard keeps it from becoming too acidic.
  4. Day 5-6: Smell shifts to pleasantly tangy/yeasty. Bubbles increase. Starter may start to rise and fall predictably.
  5. Day 7: Do the float test — drop a small spoonful in water. If it floats, your starter is active and ready to bake with.

Feeding Ratio

Standard ratio is 1:1:1 (starter : flour : water) by weight. Once established, feed once daily at room temp, or once a week in the fridge.

Signs of a Healthy Starter

Troubleshooting

Pro tip: Use a rubber band or tape mark on your jar to track rise and fall — it removes all guesswork about whether your starter is actually doubling. Whole wheat or rye flour for the first 2 weeks dramatically speeds up activation because they contain far more wild yeast than white flour. Once active, you can transition to all-purpose.

What you need

Room-Temperature Filtered

50g room-temperature filtered — recipe ingredient.

Measuring Cups & Spoons Set

Dry and liquid measuring set. Baking requires precision — guessing ruins results.

Fine-Mesh Sieve / Strainer

For sifting flour, straining sauces, removing lumps. Used in most baking recipes.

Cutting Board

Large wood or plastic board. Get one big enough that food doesn't fall off while chopping.

Whisk

Balloon whisk for eggs, cream, sauces. Essential for any recipe that says 'whisk until smooth'.

Baking Sheet (Half Sheet Pan)

Heavy-duty aluminum sheet pan. The workhorse of any oven — cookies, roasting, pastry.

Offset Spatula

For spreading frosting, glazes, and cream layers evenly. The tool pastry chefs actually use.

Cooling Rack

Wire rack for cooling baked goods evenly. Prevents soggy bottoms from steam trapped underneath.

Mixing Bowls Set (Stainless Steel)

Nesting bowls for prep, mixing, whisking. Stainless steel won't stain or absorb odors.

Silicone Spatula Set

Heat-resistant spatulas for scraping bowls, stirring sauces, folding batters.

Parchment Paper

Non-stick baking liner. Prevents sticking, easy cleanup. Buy a roll, not pre-cut sheets.

Chef's Knife (8-inch)

One good knife replaces a drawer of mediocre ones. Victorinox Fibrox is the pro budget pick.

Rolling Pin

For pastry, cookies, pie dough. French style (no handles) gives better control.

Stand Mixer

KitchenAid or equivalent. Hands-free mixing, kneading, whipping. A lifetime investment for serious baking.

Quality Saucepan (2-3 qt)

Tri-ply stainless steel. For sauces, custards, reductions. The pan you'll use most.

Sourdough Baking Book

'Tartine Bread' by Chad Robertson or 'The Perfect Loaf' by Maurizio Leo — both walk you through starter to finished loaf with photos. Invaluable for understanding the why behind each step.

$25-40
Digital Kitchen Scale

Essential — sourdough is done by weight, not volume. Even a $10 scale works fine. Eyeballing flour and water ratios is the #1 reason starters fail.

$12-25
Dark Rye Flour

Optional but powerful — even substituting 10-20% of your flour with rye dramatically speeds up a sluggish starter. The most yeast-rich flour available.

$5-9
All-Purpose Flour

For ongoing maintenance once your starter is established. Unbleached is preferred — bleached flour may contain agents that inhibit yeast.

$4-8
Rubber Spatula Set

For scraping down the jar sides and thorough mixing — incorporating air when you stir speeds up fermentation.

$8-14
Instant Read Thermometer

Optional but useful — starter is very temperature sensitive. Below 18°C it gets sluggish, above 28°C it over-ferments. Knowing your kitchen temp removes a huge variable.

$12-20
Wide Mouth Glass Mason Jars 1L

Essential — wide mouth makes stirring easy and lets you see bubble activity on the sides. Plastic works but glass lets you monitor progress better.

$8-14
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