To prepare samosas: Cook potato and carrot in boiling water 8 min or til tender. Drain.
Heat oil in wok or large skillet over med heat. Add onion to pan; cook 10 min or til lightly browned, stirring frequently. Add ginger, garlic, and red pepper; cook 2 min, stirring frequently. Stir in cumin and next 5 ingredients (through turmeric); cook 15 seconds, stirring constantly. Add potato mixture, peas, cilantro, and juice, stirring well to combine; cool slightly. Place half of filling in a food processor; pulse until coarsely chopped. Spoon chopped filling into a bowl. Repeat procedure with remaining filling.
Preheat oven to 350.
Place 1 phyllo sheet on large cutting board or work surface (cover remaining dough with damp towel to prevent drying) ; lightly coat phyllo sheet with cooking spray. Fold phyllo sheet in half lengthwise to form an 18x7 inch rectangle. Spoon about 3 T filling onto bottom of rectangle, leaving a 1 inch border. Fold left bottom corner over mixture, forming a triangle; keep folding back and forth into a triangle to the end of the phyllo strip. Tuck edges under triangle; lightly coat seem with cooking spray. Repeat procedure with remaining phyllo, cooking spray and filling to form 16 samosas. Place samosas, seam side down, 2 inches apart on baking sheets coated with cooking spray. Mist tops of samosas with cooking spray.
Bake at 350 for 13 minutes with 1 baking sheet on bottom rack and 1 baking sheet on second rack from top. Rotate baking sheets top to bottom and front to back. Bake an additional 12 min or til lightly browned.
To prepare raita, combine yogurt and mint. Season with salt and pepper to taste. Serve with samosas.