Delicious Little Cheese Pies! (Pitarakia Milou) - My Greek Dish

Ingredients

• 250g all-purpose flour (9 ounces)
• 120ml lukewarm water (1/2 cup)
• 1 tbsp olive oil
• 1 tbsp red wine vinegar (or 1 tbsp lemon juice)
• 1/2 tsp salt
• 1/2 red onion, grated
• 80g pecorino sardo, grated (3 ounces)
• 60g emmental or regato cheese, grated (2 ounces)
• freshly ground pepper
• 1 tsp fresh mint, chopped (optional)
• oil for frying