Peel the 2 onions and cut into small pieces. Peel and chop the 2 garlic cloves. Heat a deep pan over medium heat, add the onions and garlic, and cook for 2-3 minutes until softened. Add the 1 kg minced meat and cook for 5-7 minutes, stirring frequently, until cooked through and crumbly. Season with salt and pepper. Remove from heat and let cool slightly.
Clean the bell pepper(s) and cut into small cubes. Drain the corn. Roll out each portion of pizza dough. Brush with tomato sauce, spread crème fraîche on top, spread the meat mixture on top, and top with corn and diced bell pepper.
Cut the assembled dough into strips approximately 2 cm wide. Roll each strip into a snail shape. Place on a baking tray lined with baking paper. Top each snail with a small dollop of crème fraîche and sprinkle with grated cheese.
Bake in a preheated oven at 220°C (428°F) for 25 minutes until golden brown.