With this recipe, it is incredibly important to have everything ready to go prior to beginning. Add 1 and ¼ cups sugar and 3 tablespoons of water to a saucepan. Gently tap the water and sugar together with a whisk, but don’t mix it up, just sort of push the sugar to the middle of the pan towards the water a few times to help incorporate some of the water into the sugar.
Put the mixture over medium heat and stop touching it! Use a thick walled pot, and a pastry brush with water to help wash the sugar down the sides as the mixture gets hot and crystallizes on the sides. If you notice one side of the caramel is bubbling and water is dissolving, and the other side isn’t, don’t mix or stir! Instead, pick the saucepan up and gently swirl to incorporate water and sugar.
Allow the mixture to bubble and bubble for a few minutes. Continue to brush the sides with a wet pastry brush periodically to make sure no sugar crystals are forming. Cook until the sugar mixture becomes a golden amber color. Then, immediately remove from the heat and very vigorously, whisk in 1 cup of room temperature heavy cream. It will bubble up a lot, don’t worry, this is normal! Just be careful not to get burned by the steam, and continue whisking until the mixture comes together. It might take a few moments. Don't worry if some lumps are forming, keep whisking quickly.
Add 6 tablespoons of butter to the mixture and whisk until completely combined. Then, add back to the stove over medium-low heat. Continue whisking and cooking for another 2 minutes or so. It will bubble and thicken a bit.
Remove from the heat and add in 1 - 1.5 teaspoons of salt to taste, and the optional 1 teaspoon of vanilla extract, whisk to combine until smooth.
Remove from the pan and pour into heat safe containers. We want to cool down the caramel at this point and prevent it from cooking anymore in the hot pan. If you pour some into a wide container, it will cool off faster if you're looking to use it right away! Top with a little flaky salt if desired, and enjoy with your favorite desserts!
Store leftovers in an airtight container in the fridge for up to 2 weeks. Reheat gently in the microwave (at about 70% power) to make it pourable again. To freeze, store in an airtight freezer safe container in the freezer for up to 3 months.