Mango, Jicama and Radish Salad with Peanut Dressing

I was watching Simply Delicioso the other day on The Cooking Channel and Ingrid was making a salad with Jicama.  I have heard of it but never had it.  It is sometimes referred to as a Mexican apple as it has the crunchiness and texture on an apple.  It is very difficult to peel it though and I had to actually cut off chunks of it.  I figured I would try it and the peanut dressing looked really good.  I left out the radishes in my salad though.  

3 tablespoons smooth peanut butter
1/4 cup fresh lime juice (about 2 limes)
2 tablespoons light brown sugar (I used dark)
2 tablespoons canola or vegetable oil
Salt
8 large radishes, halved lengthwise and thinly sliced crosswise(didn’t use)
6 cups mixed baby greens, washed and dried
1 large or 2 small mangoes, peeled, fruit cut off the seed and cubed
2 cups peeled and cubed jicama (cut into about 1/2-inch cubes)
1/4 cup fresh cilantro leaves (not pictured)