Tojásleves (Hungarian Egg Soup)

Ingredients (serves 4):

• 1 liter (4 cups) water or broth
• 1 tbsp oil or butter
• 1 small onion, finely chopped
• 1–2 cloves garlic, minced
• 1 tsp paprika
• 2 eggs
• 1 tbsp flour (optional, for thickening)
• 1 tsp vinegar
• 1 tsp sugar (optional)
• Salt and pepper to taste
• Optional: caraway seeds, parsley