How long does mattha milk last?

How long does mattha last?

There is no official shelf life for homemade mattha, because it varies with the milk, how clean your equipment is and how cold the fridge is. As a cautious rule, drink fresh mattha the same day for best taste and finish it within a day or two if kept cold. Packaged spiced buttermilk follows the use-by date on its pack, and once opened it is best finished within a short time.

How to store it

• Refrigerate promptly. Do not leave it out for long; food safety guidance from the US FDA says to refrigerate leftovers within 2 hours.
• Keep the refrigerator at 40 degrees F (4 C) or below, using a fridge thermometer.
• Use a clean, covered jar or bottle and keep it away from the door, where temperatures swing most.
• Add garnishes such as coriander or fresh mint only when serving; they spoil faster than the drink.

Can you freeze it?

You can, but buttermilk-type drinks often separate and turn thin or grainy when thawed. If you do freeze it, blend it again after thawing and use it in cooking or for smoothies rather than as a drink on its own.

Signs mattha has gone bad

• A sharp, rotten or yeasty smell, rather than a clean sour tang
• Mold, pink or gray spots, or a slimy film
• Bulging or leaking packaging
• Unusual fizz that you did not expect

Mattha is naturally sour, so sourness alone is not a warning sign. A smell or look that seems wrong is. When in doubt, throw it out.

Why you cannot trust a fixed number

Mattha is usually made from yogurt or buttermilk blended with water and spices. Diluting it and adding fresh herbs shortens how long it keeps compared with the plain yogurt or buttermilk it started from. Unpasteurized milk raises the risk, so use pasteurized dairy.

This is general guidance, not medical advice. People who are pregnant, elderly, have weak immune systems or are feeding young children should be especially careful with dairy that has been stored for a while.