Preheat oven to 390 F / 200 C.
Cut the tofu in half and dry the pieces inside a kitchen towel.
Cut the tofu into bite sized cubes.
Cut potatoes into bite sized cubes.
Mix the marinade ingredients: chop garlic into small pieces.
Add olive oil, chopped garlic, lemon juice and all spices in a bowl. Whisk well, taste and add more sweetener / salt to taste.
In a sheet pan, coat tofu and potato cubes in the marinade until all pieces are fully coated.
Slice a lemon and place slices on top of tofu and potatoes.
Roast in the oven for 20 minutes, toss tofu and potatoes around so that they will be evenly roasted. Roast for another 20 - 25 minutes.
Whisk yogurt sauce ingredients in a bowl.
Serve sheet pan meal with the sauce and fresh herbs.