Easy Potato Curry

Ingredients

• 2 potatoes ((maris piper are good))
• 1 onion (medium)
• 1 teaspoon chilli flakes
• 1/2 teaspoon cumin seeds
• 1/2 teaspoon fennel seeds
• 1/8 teaspoon mustard seed
• 1/4 teaspoon turmeric
• 1/4 teaspoon chili powder
• 200 g chopped tomatoes
• 1 teaspoon sugar
• 1 tablespoon dijon mustard ((with added water) )
• drizzle extra virgin olive oil
• 1 teaspoon salt