Vegetable Samosas

Name: Vegetable Samosas
Ingredients: 1 onion (finely grated); ½ small Cucumber (approx. 150 g), peeled, seeds removed, finely grated; 1.333 cups Yogurt; 1 tablespoon sugar; lemon juice (from one lemon); 1 pinch ground Cumin; fennel seeds (to garnish); mint (to garnish); ¼ cup Ghee; 1 ⅔ cups flour; 2 Cardamom pods (seeds removed); 2 teaspoons brown Mustard seed; 1 pinch Turmeric powder; 2 cups baking potatoes (diced); 2 Garlic cloves (chopped); ½ cup frozen peas (defrosted); 2 tablespoons fresh cilantro leaf; Oil (for frying)