Chop the strawberries and mango, add to a medium-size bowl.
Dice the jalapeno and red onion, add to the bowl of ingredients, and stir to combine.
Add the vinegar, honey or sugar, and salt. Stir to incorporate. Refrigerate 15 minutes for the flavors to blend before serving. Serve immediately, or store in the refrigerator up to one day. 
 This recipe is perfect for making ahead of time. Keep in mind that the longer that the fruit sits in the vinegar, the flavors will continue to develop, and the fruit will soften. When making several hours ahead of time, you can save the vinegar, sweetener, and salt to add 15-minutes before serving.