Prepare Your First Layer (Purple): Start with the blackcurrant jelly. Break the jelly cubes into a heatproof measuring jug. Pour in 285ml of boiling water and stir continuously until the cubes have completely dissolved. Let the liquid cool at room temperature for about 20-30 minutes. It should be lukewarm, not hot.

Pour and Chill Layer One: Arrange six clear glasses or plastic cups on a small baking tray (this makes it easier to move them in and out of the fridge). Carefully divide the cooled purple jelly liquid evenly between the cups. Place the tray in the fridge and chill for 20-30 minutes, or until the jelly is just set but still a bit sticky to the touch. It shouldn't be rock solid.

Prepare the Second Layer (Green): While the first layer is chilling, prepare the lime jelly. Repeat the process: break the cubes into a clean jug, add 285ml of boiling water, stir until dissolved, and then let it cool completely to room temperature. This is crucial – adding warm jelly will melt the layer underneath. I find that leaving it on the counter for the full 30 minutes while the first layer chills is just about right.

Add the Second Layer: Gently check the purple layer. If you touch it lightly with your finger, it should be firm enough not to break but still have a slight tackiness. Very gently pour the cooled green jelly liquid over the purple layer. The best way to do this is by pouring it over the back of a spoon to soften its landing and prevent it from breaking the layer below. Return to the fridge for another 20-30 minutes.

Continue Layering: Repeat the process for the remaining colours in this order: yellow (lemon), orange (orange), and finally red (strawberry). For each step, dissolve the jelly, let it cool completely, and pour it gently over the previously set layer before chilling again for 20-30 minutes.

Final Chill: Once you've added the final red layer, the cups need a longer chill. Place them in the fridge for at least 2-3 hours, or until all the layers are fully and firmly set.

Serve: Just before serving, you can top your Layered Rainbow Jello Cups with a swirl of whipped cream and a scattering of colourful sprinkles if you wish.