Sirene Starter

Bacillus Bulgaricus

Bulgarian Sirene Starter

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Our Bulgarian Sirene (hard white brined cheese, similar to feta cheese) starter makes a delicious sirene that turns out perfectly every time.

Whether you like your sirene crumbly or creamy with excellent taste and great aroma, it’s never been easier to make your own sirene.

Bulgarian Sirene is a type of hard white cheese. It is very similar to the feta cheese variety but has a sharper, tarter taste and the most delicious aroma you can imagine thanks to the presence of lactobacillus bulgaricus lactic acid bacteria.

Each pack contains loose powder mix, in perfect proportions, of a collection of bacterial strains required to make sirene, amongst which  — the ubiquitous lactobacillus bulgaricus and streptococcus thermophilus.

Our Sirene starter is made and packaged in Bulgaria. It is organic and fully natural with no preservatives, additives, artificial colors or flavors. It contains no GMO ingredients and it is gluten free.

Each pack contains freeze-dried live active lactic acid sirene starter cultures. Since the bacteria is grown on organic dried milk powder, the pack also contains a minute (very small) quantity of dried organic milk powder, which is completely consumed by the bacteria during fermentation.

Bacillus Bulgaricus sirene starter is fully natural with no additives, preservatives, artificial colors or flavors. It contains no GMO ingredients and it is gluten free.

It is manufactured and harvested in a strictly regulated sterile environment so it does not contain nor it has been in contact with nuts, soy and other common allergens.

When you introduce the live culture into prepared milk the streptococcus thermophilus bacteria goes into action first and prepares the perfect environment for lactobacillus bulgaricus and the rest of the cultures, which starts multiplying and slowly turns the milk into genuine Bulgarian sirene.

These beneficial, transient bacteria work together in the fermentation process that turns milk into a naturally sweet, smooth, fresh-tasting, super delicious sirene.

The process takes approximately 24 hours to complete.

More Details

Ingredients: Live active lactic acid cultures (lactobacillus bulgaricus, streptococcus thermophilus, lactococcus lactis).

Type: Bulgarian sirene culture.

Strength: 1 gram of starter contains more than 25 billion cfu of lactic acid probiotic bacteria. 100% potency guaranteed.

Nutritional Information: Available here

Origin: Produced in Bulgaria.


Best to store in the FREEZER.

Use by the date indicated on the label.

Bacillus Bulgaricus starters are shipped in sealed sachets.

Transporting the packs (i.e. shipping them to you) at ambient temperatures (even in the warmest climates) is perfectly OK and will not damage the live cultures. We use a freeze-dried process that keeps the strains alive and comfortable even during long trips in hot weather.

Once you receive your starter packs – pop them in the refrigerator or the freezer for best storage.

  • 2+ years at around 0°F (-18°C) or lower (in the freezer)
  • 1-2 years at around 40°F (4°C) (in the fridge)
  • Up to 1 year at ambient (room) temperature.

Unfreezing the starter packs and freezing them again (e.g. when using only a portion) is OK to do, even multiple times.

Make sure you store open sachets in a way that prevents moisture from getting in, i.e. well closed in a Ziploc bag or wrapped around and fastened with a rubber band.

How to use Bacillus Bulgaricus sirene starter

Making Sirene is very easy and requires no special handling or aging, so you can easily and quickly do it at home.

Check here for sirene making steps.

Bacillus Bulgaricus Sirene Starter

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(367 reviews)

Our Bulgarian Sirene starter makes a traditional Bulgarian hard white cheese with unique taste and the most delicious aroma you can imagine.

The starter makes a delicious Bulgarian sirene (hard white brined cheese) that turns out perfectly every time. Crumbly or creamy with excellent taste and great aroma, it's never been easier to make your own sirene.
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