Grate the ginger (I use a ceramic grater) and measure the amount for the recipe. You will need ¼–½ tsp for one batch. If you are not a huge ginger fan, start with the smaller amount. You can always add more later.
In a small bowl, combine the grated ginger, miso, soy sauce, sugar, and rice vinegar. Whisk it all together really well to dissolve the miso and sugar (I use this flat whisk).
While whisking the mixture, add the neutral-flavored oil to the mixture very slowly, in a thin stream, for a successful emulsion. Then, slowly add the roasted sesame oil while whisking.
Add a splash of lemon juice and whisk it all together.