Preheat oven to 375° and place rack in the center
Prepare the pita bread by cutting off the edge, cut the round in half and separate
Brush the inside of the bread with olive oil then add salt and pepper and garlic powder if desired.
Place the bread on a cooling rack inside a sheet pan, oiled side up
Place in the oven for 10 to 12 minutes until browned, turning occasionally for even browning
Remove and cool
Squeeze the lemon juice into a small bowl then add the garlic which has been pasted by flattening with a knife, set aside until used,
Mix the arugula, cilantro, tomato, cucumber and green onion in a large bowl and combine.
When ready to serve, add the toasted pita bread that has been broken into 1/2 inch pieces, then add lemon juice, then drizzle with 3 or 4 tbsp olive oil, mix and serve right away