Step 1

Snip the jelly into cubes, and place them into a serving bowl.

Step 2

Add the 150mls of freshly boiled water and stir to dissolve. This may take 3 to 4 minutes.

Step 3

Add 150mls of cold water, and put the jelly in the fridge for between 45 minutes to 1 hour, until the jelly is ALMOST set, it will still be very wobbly and almost runny.

Step 4

Whisk the chilled evaporated milk with the lemon juice in a mixing bowl until it has tripled in volume and is thick and frothy.

Step 5

Add the just-set jelly to the evaporated milk mixture and whisk again until it is smooth and all blended together. If using a red berry jelly it will be a very pale pink. It's at this stage that you can add any chopped fresh berries, or frozen berries.

Step 6

Spoon the mousse back into the serving bowl the jelly was set in, and smooth the top of the mousse.

Step 7

Place the mousse back in the fridge or a cold place to set completely. This will take about 1 hour. Once it has set, this mouse will last for up to 2 or 3 days in the fridge.

Step 8

Serve with fresh berries, cream or even a drizzle of evaporated milk for that 1970's retro taste!