In a mixing bowl, combine garlic, oil, and mustard. Stir well.
Place four slices of whole-grain bread on a baking sheet. Brush them with garlic mixture on a top only and toast for a few minutes until they are lightly golden brown. Do not overcook; you will burn the garlic.
Lay the sauerkraut on top of the toasts and serve immediately! I used store-bought red apple sauerkraut and simple white cabbage on my sandwich. And that’s it! So easy to make, and once you taste it, you will want to eat it again!