In a medium-sized microwave safe bowl, mix the cranberries and hot water. Cover the bowl and cook at high heat in the microwave for two minutes. Remove the bowl and let the berries steep for ten minutes.
Use an electric immersion blender to puree the berry and water mixture. The mixture should look like a thick juice. Add sugar and lemon juice.
Heat the syrup on a medium-low to medium setting until the mixture begins to bubble and the syrup thickens, stirring to keep from scorching the liquid. Remove from the heat and let cool. The syrup will become thicker as it cools. This makes about 12 ounces of syrup.