Instructions:
Prepare the Skewers: To make the skewers, soak 4 bamboo skewers (8 to 12 inches long) in water for about 30 minutes. (You can skip this step by using metal skewers.)
Make the skewers: Make each skewer by wrapping the chicken with sage and prosciutto. Place the pepper and onion on the skewer. Repeat until all 4 pieces of chicken are used.
Mix all ingredients for the tomato fresco together. Season with salt & pepper.
Grill skewers until heated thoroughly.
Top with tomato fresco.