In a small bowl, combine and mix the heavy cream and cultured buttermilk. Pour mix into a wide mouth mason jar. Allow to sit at room temperature for 12 hours and then store in the refrigerator for up to 3 weeks.
FOR LATKES:
much of the liquid as possible. Quickly transfer the mixture to a large bowl. Add the eggs, flour, salt, and pepper, and mix until the flour is absorbed.
In a medium, heavy-bottomed pan, over medium-high heat, pour in about 1/4 inch of the canola oil. Once the oil is hot, drop large spoonfuls of the latke mix into the hot pan, with plenty of space in between. Use a spatula to flatten and shape the latkes into discs. When the edges are golden brown and crispy, about 5 minutes, flip. Cook until the second side is deeply browned, about another 4-5 minutes. Transfer the latkes to a paper towel- lined plate to drain and sprinkle with salt while still warm. Repeat in batches with the remaining latke mix.