Pre-heat the oven at 180 degree celsius temperature for 10 minutes.
Grease both the cake tins with little oil and dust with flour or you can place parchment/Butter paper.
In a mixing bowl, sift through all purpose flour twice so that there are no lumps. Keep it aside.
In another mixing bowl, beat together yogurt and sugar with the help of hand/stand mixer until smooth. Now add vinegar, baking soda and baking powder and mix well. Keep aside for 3-4 minutes so that soda reacts with yogurt and bubbles form on top.
Add oil and mix. Now add sifted flour and vanilla extract and mix it well so that all ingredients come together smoothly. Pour the batter into the baking tins dividing half in each. Tap the tins on worktop 2-3 times and place them in the preheated oven gently.
Let them bake for 25-30 minutes until a knife/toothpick inserted in middle comes out clean. Switch off the oven.
Place the whisk attachments and mixing bowl in fridge for cooling in which you are planning to whip the cream for icing.
Take the tins out carefully and place them on a cooling rack. After 10-15 minutes, gently take out the cake from both the tins and cool them for 10 more minutes. After that, place them in fridge for 30 minutes if you're planning to do icing same time.
Take out the whisk attachments and mixing bowl from fridge. Pour chilled cream into the bowl and start whipping with hand/electric mixer on low medium speed. Soon you'll see bubbles forming on top of cream. Whip little more and the cream will start to thicken.
After around 6-7 minute of whipping, you will see soft peaks forming in the cream. Gently scrap all the cream from sides of bowl and add 4 tablespoon of icing sugar, your preferred flavouring and deep pink colour to it and start whipping again on medium-high speed. You will see stiff peaks in cream after beating it for 4-5 minutes.
Stop whipping at this stage and check if the cream has acquired stiff peaks. Scrap all the cream from sides of the bowl and run your spatula in zigzag pattern on cream. If cream retain its pattern(not melting), that means its done. Its ready for icing now.
Take both the cakes out of fridge and slice both of them from the middle. This way you'll have 4 slices of cake. Now take a small bowl and add rest 2 tablespoon of icing sugar and 4 tablespoon of water to it. Mix it well and we will use this syrup to moisten our cake. Chop or crumble half of gulab jamun into small pieces.
Now place a cake board on turn table and apply a little whipped cream in the centre. Place a slice of cake on it and press gently so that its sticked nicely. Spread one tablespoon of sugar syrup all over the slice. Now spread cream all over the slice with the help of palette knife or spatula. Smooth it out so that its spread evenly all over.
Spread crumbled/chopped gulab jamun pieces on the slice and cover it with another cake slice. Spread sugar syrup and cream again just like in previous step and spread pieces of gulab jamun. Place another slice of cake on it and repeat the process again.
Now place the last slice of cake and spread remaining sugar syrup all over the top slice. Spread little whipped cream now, on top and sides of cake covering the whole cake with thin layer of whipped cream.
Smooth it out with the palette knife or cake smoother with rotating the turn table, so that cake has little smooth finish all over. This is called crumb coating of cake and is necessary so that cake crumbs doesn't mix with whipped cream when you finally smooth out the cake. Place the cake in fridge for 15 minutes.
Take the cake out of fridge and apply more whipped cream all over. Smooth it out to give it a nice finish. Sprinkle few chopped pistachios and rose petals on the sides of cake.
Now fill the rest of the whipped cream in a piping bag with nozzle of your preferred design. Here, i have taken wilton 1M nozzle. Make rosettes or your preferred design on cake. I made rosette on top and border on the bottom of cake.
Cut the rest of the gulab jamuns in half and place them on top. Sprinkle rest of the chopped pistachios and rose petals on top. Place gold edible leaf pieces, few on gulab jamun and rest all over cake. Keep the cake in fridge for 10-15 minutes. Gulab Jamun cake is ready.
Cut and enjoy...