In a sauce pan over medium heat, combine shallots, ginger, lemon juice, and white wine. Cook until liquid is reduced to approximately 2 tablespoons. Stir in heavy cream, and bring to light boil. Reduce cream by half; do not burn. Stir in soy sauce, then transfer to blender. Blend on low while slowly adding butter, a few cubes at a time, until all of the butter is emulsified. Roughly chop or tear shiso, add to sauce, and blend for about 10 more seconds. Season to taste with kosher salt and pepper. Keep sauce warm.