Asian Pickled Red Onions

0 Cut the red onion in half then thinly slice it using a mandolin or knife. This should yield about 3 cups of onions. Transfer to a clean and sterilized glass jar. 
1 In the jar with the onions, add garlic, white peppercorns, Szechuan peppercorns, and dried chilis. 
2 In a pot, combine white vinegar, water, salt and sugar. Bring to a simmer over medium heat. Once the sugar and salt has fully dissolved. turn off the heat. 
3 Pour the mixture over the red onions in the glass jar. Using a spoon or spatula, push the red onions down so that they are fully submerged. 
4 Set the onions aside to cool down completely. Once cooled, cover with a tight lid then transfer to the fridge.
5 Serve and enjoy chilled!