Marmite have joined forces with drink firm Guinness to give a new meaning to going for a jar.
The two iconic brands have combined to make a limited edition yeast extract spread.
The main ingredient of normal Marmite is a blend of brewing yeasts which are left over when beer is produced.
Now it has been made exclusively from yeast left over after the famous Irish stout is brewed.
The nonalcoholic spread is said to have a distinctive yet subtle Guinness flavour. It comes packaged in a black jar with white lid, to resemble a pint of stout.
A total of 300,000 jars, priced at £2.49, are being produced and will be on shop shelves from this weekend for six weeks, to coincide with St Patrick's Day on March 17.
Cheryl Calverley, of Marmite, said: "This is the most unusual innovation in our history. We will be watching carefully to see if customers want this as a permanent option."