Share 'Mexican "Ceviche" Salad'

This recipe I learned from my mother! She used to make this for us during the summer. We love it :) Since shrimp was very expensive for us in mexico, she would prepare this just with raw vegetables and serve it on top of a tostada. It tastes just the same as regular ceviche. I've made this for my kids about three times the past few days and they loved it!! :)