Potato Cream Cake

Ingredients
Make the Cream
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Fresh Milk 600.0 g
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Simple Syrup 50.0 g
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Ready-to-use custard 350.0 g
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Purple yam, steamed & pulverised 250.0 g
Make the Cake
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Whole Eggs (7 pieces) 320.0 g
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Egg yolk (4 pieces) 80.0 g
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Cake Stabilizer 10.0 g
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Sugar 160.0 g
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All-Purpose Flour 130.0 g
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Milk Powder 15.0 g
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Cake Margarine 125.0 g