Purple carrot cake – Baking with purple carrots

Carrots are orange, aren’t they? No, not necessarily! Purple and yellow carrots are a relatively new variation of carrots in our supermarket (at least in my perception, until I found out it’s actually the purple ones that were there before the orange ones). Most supermarkets still only sell the orange ones, but whenever I see the different colours, I tend to buy them. Why? Because I like trying new things, think it’s good if we don’t eat only one variety of crops and it makes your food look special!

That’s why I decided to use them for making a carrot cake, it gives the carrot cake a well deserved facelift and allows me to ramble a bit about science & carrots & colour. What else can a human being want?

Purple carrots – the origin story

It seems that purple carrots itself are nothing new to humanity. Instead, it’s the orange one that’s the most recent ones. Centuries ago carrots were already grown in the Middle East, however, they tended to be purple and yellow, not orange. Only a few centuries ago farmers started growing orange carrots instead of the fancier coloured ones. Apparently because they were easier to grow and more resistant towards the European climate.

On food colour science

The orange carrot has been developed by farmer through basic breeding principles and over the years this breeding has continued using nowadays knowledge. We now also know better how those colours of carrots are formed.

Colours in food (mostly fruits & vegetables) are widespread and fascinating to study. There are a lot of different colours all caused by different groups of molecules. It’s real chemistry. You will also see reoccuring patterns, so if you’ve read our post on tomatoes (yellow & red ones) or the one on oranges (why are they orange) you might hear some familiar terms.

freshly sliced orange, purple and yellow carrots

Carrot colour science

So what molecules (or molecules groups) cause all these nice colours?

For orange carrots you might have heard. It is often said that eating carrots is good for your eyes and that is indeed true. The reason for the good eyes is actually the colour of the carrot. The colour orange is caused by β-carotene, a pre-cursor of vitamin A and vitamin A is beneficial for your eyes. β-carotene belongs to the large group of molecules called carotenoids.

Yellow carrots

Xantophylls are the molecules that give the yellow carrots their colour. A very common xanthophyll in carrots is lutein. Yellow carrots barely have the orange pigment orange carrots have. That said, since xantophylls also belong to the group of carotenoids, they do also contain high levels of this group as a whole. Also, just in case you’re wondering whether you should avoid the yellow ones since they contain less β-carotene and thus miht be less good for your eyes. Don’t worry, lutein is also beneficial for your eyes.

Purple carrots

The purple colour of purple carrots is thanks to the anthocyanins. That said, purple carrots can actually contain more than twice the amount of β-carotene than orange carrots. The colour is simply overpowered by the strong purple hue from the anthocyanins.

Did you know by the way that you can actually eat too many carrots? It will result in too mcuh carotene in your body and you will turn orange. The cure is easy, just eat no more carrots and the orange hue will disappear again.

Non-orange carrots – Sensory Evaluation

To me, orange and purple and yellow carrots taste quite similar. I don’t tend to eat whole raw carrots though. I tend to use them in a variety of dishes. In that case they contribute to the overall flavour, but do not determine it completely.

The great thing about especially the purple carrots really is there colour. The colour is super strong, I would say you can compare it to that of beets. Using purple carrots in dishes will surely throw off your normal colour. It might look a little weird, but it does make dishes more exciting, I’ve had guests asking what those purple carrots are. Once I explained they’re ‘just’ carrots, they had a smile on their faces.

Same with this carrot cake. It looked a little weird for different, but it tasted great, just like a good carrot cake would.

purple carrot carrot cake slice

Purple carrot carrot cake recipe

Purple carrot cake - Baking with purple carrots
 
Prep time
Cook time
Total time
 
Author:
Serves: 1 cake
Ingredients
  • 1 purple carrot
  • 2 apples
  • 50g raisin
  • 160g butter
  • 50g light brown cane sugar
  • 150g white sugar
  • 2 eggs
  • 2 tbsp lemon extract
  • 1 tbsp vanilla extract
  • 200g flour
  • 1¼ tsp baking powder
  • 1 tsp cinnamon
  • ½ tsp nutmeg
  • ½ tsp clove
  • ½ tsp ginger
  • 50g walnuts
Instructions
  1. Grate the carrot, peel the apple and grate the apple as well.
  2. Mix the butter with the sugars.
  3. Mix in the eggs to the butter and sugar.
  4. Add the extracts.
  5. Mix the flour, baking powder and spices (to make sure the spices are well mixed through).
  6. Add the dry ingredients to the butter, sugar and egg mixture and fold through. Mix in the carrot, apple and walnut.
  7. Place in a cake pan and bake in a pre-heated oven at 160C for approx. 45 minutes. Use a cake tester or tooth pick to check whether the cake is done. If the apples or carrots are quite large it might take a little longer due to the higher moisture content.

Sources

The carrot purple and other curious stories of the foods we eat (p65-69)

Handbook of vegetable preservation and processing (p456-460)

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