Step 1

In a medium-size sauce pan, melt the butter over medium heat. Add the brown sugar and lemon juice and stir to combine. The mixture will look like wet sand.

Step 2

Bring to a boil then reduce to a slow steady boil and continue cooking, stirring frequently for 2-3 minutes, until the mixture looks smooth rather than grainy. (At first the butter and brown sugar may seem to be separated but it will come together as it cooks.)

Step 3

Stand back a little (as the mixture will sputter a bit) and add the heavy cream. Stir to combine then return to a low steady boil. Cook for another 4 minutes, stirring frequently. Add the vanilla, Scotch (if using) and sea salt. Sir to combine.

Step 4

Transfer to glass jars and allow to cool completely. The sauce will thicken as it cools. Store in the refrigerator when not in use. The sauce will keep well for 2-3 weeks in the refrigerator.

Step 5

Rewarm gently before serving in a saucepan over low heat or in the microwave for 20-30 seconds. Do not bring to a boil when rewarming. Serve the sauce drizzled over ice cream, pies, tarts, apple and pear desserts, pumpkin desserts, etc. Sprinkle with a pinch of extra flaky sea salt when serving.