In the blender, place the condensed milk and the table cream, blend for 1 minute, add the juice of the lemons and blend it all together again until combined.
Dip the biscuits in milk and place them in the bottom of a baking tray, making the first layer. Make a layer with the lemon cream, covering the biscuits. Then dip the biscuits in milk again and make another layer of biscuits over the cream, repeat this process once more and add the rest of the cream on top. Take it to the fridge and leave for 30 minutes.
Sprinkle some lemon zest over the trifle.
Serve.