Mexican tomato salsa

Ingredients

• 1/2 red onion
• 1 garlic clove
• 4 tomatoes
• 1/4th green bell pepper
• 1/2 red bell pepper
• 1 red chili pepper
• 1 large spoonful of tomato paste
• 1 recipe for Mexican spice mix (3 tablespoons)
• sunflower or other neutral oil
• 100 ml water