Mix the vinegar, sugar and salt in a medium bowl. Microwave for 30-60 seconds to dissolve the sugar. Mix in the Sriracha and allow to cool while slicing veggies.
Toss the thinly sliced veggies in the vinegar mix.
Refrigerate until ready to use, at least 30 minutes.
Notes
Homemade quick pickled veggies will keep well for up to 2-3 weeks in the fridge... But they never last that long in this household!