Aroma milk composition comprising diacetyl and uses thereof

A method of preparing an aroma milk composition comprising diacetyl producing strain Lactococcus lactis ssp. lactis biovar. diacetylactis strain DL2126, VTT E-123249, and diacetyl in an amount of at least 50 mg/kg in a milk based medium, the method comprising:

• providing a mixture comprising diacetyl producing strain Lactococcus lactis ssp. lactis biovar. diacetylactis strain DL2126, VTT E-123249 and a growth medium comprising dairy;
• and
• incubating the mixture thus obtained for 10 to 28 hours to provide the aroma milk composition comprising diacetyl producing strain Lactococcus lactis ssp. lactis biovar. diacetylactis strain DL2126, VTT E-123249 and diacetyl in an amount of 50 mg/kg at the minimum based on the weight of the growth medium after incubation.