Preheat oven to 160c.
Grease and line your 23x13 cm loaf tin with baking paper.
Mix together the pumpkin, sugars, oil, water, eggs, lemon zest, salt and spices. Beat until combined.
In another bowl combine the flour and baking powder, add to the bowl with the other ingredients in, and whisk until combined and smooth.
Pour into a lined and greased loaf tin, sprinkle on pumpkin seeds and bake for about 1 hour until cooked through and a skewer comes out clean. (Check after 45 minutes but it may take up to 1 hour 15 depending on your oven).
Allow to cool for five minutes and remove from the tin.
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