1/2 Fresno chile, halved lengthwise, seeded if desired and finely sliced
1 cup white vinegar
3/4 cup sugar
1 teaspoon kosher salt
Add the cucumber slices and chile slices to a medium bowl and toss to combine.
In a medium saucepan, add the vinegar, sugar, 1/2 water and salt. Heat gently, stirring, just until the sugar and salt dissolve. Pour over the cucumbers and chiles in the bowl. Set aside to marinate at least 15 minutes before serving.