I eat ev´rything, when i´m on Mauritius, also icecream from the icecreamcar on the beach, mango and ananas with chilisauce etc. and I never had any probs with illness.
In Pointe aux Piments near the street, ypu can get local food very cheap during noon, try it.
And of course there are local restaurants around the island where you should try the food, you get chinese, indian, creole food and of course european, but this is not local food
Just be careful with the chili sauce, when they tell you it´s hot, it really is and you should try a little bit first