The preparation for this is a bit tedious but the flavor payoff is worth it! Bright, tangy, sweet, and floral, with this marmalade, a little goes a long way. I like to use it on top of pancakes and waffles or crepes, as a glaze for meats such as duck, paired with cheese, and in salads.
Combine the kumquats, lemon juice, lemon zest, allulose, stevia, and water in a small pot. Stir and let sit for at least two hours.
Heat the pot over medium heat until simmering. Simmer, stirring occasionally for about 40 minutes, or until thickened and the mixture coats the back of a spoon. Let cool completely and refrigerate for up to 2 weeks or freeze for several months.