Creating this fondue is as delightful as it is straightforward. Here are the steps to bring this lovely dessert to life:

1. In a small saucepan, combine the heavy cream and unsalted butter. Heat over medium-low until the butter melts and the cream is warmed, about 3-4 minutes. Stir occasionally to prevent scorching.
2. Remove the saucepan from heat, and add the dark chocolate chips. Let them sit in the warm cream for a minute to soften.
3. Stir the chocolate mixture until smooth and glossy. This is the point where you can add the vanilla extract and your choice of liqueur for an added layer of flavor.
4. Transfer the chocolate fondue to a small fondue pot or a heatproof bowl. Light a tea candle beneath the pot to keep the chocolate warm and fluid.
5. Arrange the strawberries and raspberries on a platter. For a rustic presentation reminiscent of the Devon countryside, use a wooden board.
6. Invite your partner to dip the berries into the chocolate, sharing stories and laughter as you indulge in this sensory delight.

Remember, the key here is patience and gentle heat. Chocolate is a sensitive ingredient; too much heat can cause it to seize, a lesson I learned the hard way during a bustling family gathering.