Tuna and shrimp pizza with cheese

Ingredients

• 250 g frozen icy sea shrimps
• 2 medium sized onions
• 250 g cherry tomatoes
• 125 g black olives
• 2 tins Tuna
• 1 tablespoon of olive oil
• Salt
• Pepper
• 150-200 g Emmental
• 1⁄4 Pizza dough
• Flour
• 200-300 g strained tomatoes with herbs
• 1-2 tsp dried oregano
• baking paper