This is a basic pickling liquid. It’s a 3:2:1:0.3 ratio so it’s easily scalable. 3 parts vinegar, 2 parts water, 1 part granulated sugar, and 0.3 parts kosher salt. The 0.3 may be confusing… but it’s just 10% of the vinegar. I hope you’re not totally confused…
225 g rice wine vinegar
150 g water
75 g granulated sugar
22.5 g kosher salt
Mix all ingredients together in a saucepan over high heat. Whisk to dissolve the sugar and salt.