Bring the water to a boil in a saucepan.
Meanwhile, slice the onion against the grain thinly and put it in a heat proof bowl.
Once the water boils, pour 3⁄4 cup into a glass jar and the rest to the bowl with onions and soak for 10 minutes.
Add sugar, honey, salt, apple cider vinegar and lemon juice into the jar and mix well.
Once the onions are done soaking, drain and place the onions in the glass jar, press down with a spoon to submerge all the onions in the pickling solution.
Let the onions sit in the solution at room temperature for at least an hour before eating. After an hour, keep it in the fridge for up to 2 weeks.