Spice Blend and Curry Sauce

1 tbsp coriander seeds

2 tbsp cumin seeds

2 sticks cinnamon sticks

10 cardamom pods

10 g mustard seeds

1 tsp black pepper corns

2 dried red chillies

4 star anise

4 leaves dried bay leaves

4 garlic cloves

5 cm ginger

2 large tomatoes

2 green chillies

1 tsp sugar

2 tbsp rapeseed oil

100 ml double cream

1 pinch salt

1 pinch black pepper

0.5 juice of lemon

1 sprig coriander