Baking Low Sugar Log Cake

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Part Ingredients (grams) Process / Notes
Sponge Room temperature:

Eggs 200 g (4 eggs)
Sugar 65 g
Sifted Cake flour 60 g
Milk 30 g
Oil / melted butter 30 g
Vanilla extract ½ tsp
Separate eggs.
Whip whites + 40 g sugar to soft peaks.
Whip yolks + 25 g sugar till pale.
Mix milk + oil into yolks.
Sift flour, fold gently.
Fold in whites in 2–3 additions.
spread thinly on parchment paper
over 20 cm x 30 cm baking tray.
Baking Bake 170 °C, 12–15 min.
Surface just set, no browning.
Roll once while warm,
cool completely.
Filling Mascarpone 200 g
Whipping cream 150 g
Sugar 20 g
Vanilla ½ tsp (optional)
Whip cream to soft peaks.
Whisk mascarpone + sugar until smooth.
Fold cream into mascarpone gently.
Spread evenly on cooled un-rolled sponge,
leave 1 cm edge(border);
roll back gently.
Coating Dark chocolate 150 g
Whipping cream 150 g
Heat melt cream, pour over chocolate.
Rest 1 min, stir smooth.
Spread on log, 
(use fork) create bark texture.
Finish Chill 1–2 hours.
Slice with hot dry knife.
Store refrigerated.