Preheat your oven to 180°C (350°F) and line a rectangular cake tin with baking paper (mine was 8" x 12" or 20cm x 30cm).

In a small saucepan, melt the butter, golden syrup and brown sugar.

While the butter is melting, mix together all of your seeds, oats, and citrus zest.

Pour the melted butter mixture into your dry ingredients, and mix well.

Press oat mixture into the pan in an even layer, and bake in preheated oven for 15-20 minutes, or until golden brown on top.

Allow to cool and cut into bars. Store in an airtight container or well wrapped with cling film.