Prepare the jar

• Place the whole peeled red onion into a jar.
• Add the salt, sugar and peppercorns.
• Smash the garlic clove and add it to the jar.

Add vinegar and hot water

• Pour in the white vinegar.
• Bring water to a boil and fill the jar to the top with the hot water.

Seal and marinate

• Seal the jar and give it a good shake.
• Place in the fridge and let it marinate until the onions turn pink.