Potato and sweet potato tian with tomato sauce and organic mustard

4 people – 1h30 cooking time – 30 min preparation time :

  • 4 medium-sized sweet potatoes
  • 4 large potatoes
  • 2 cans of diced tomatoes
  • 2 cloves of garlic
  • 1 tablespoon of mustard
  • olive oil
  • salt and pepper


  1. Preheat the oven to 180 degrees.
  2. Peel the sweet potatoes and wash the potatoes. Slice them into thin rounds with a mandolin or a knife.
  3. In a salad bowl, coat the potato and sweet potato slices with a drizzle of olive oil and a tablespoon of mustard, salt and pepper.
  4. Mix everything together so that the potatoes are well coated.
  5. Pour the cubed tomatoes and chopped garlic into the bottom of an ovenproof dish and add the equivalent of half a can of water cubes.
  6. Arrange the vegetable slices in the dish, pressing them together vertically. Cover the dish with baking paper and bake for 1 1/2 hours.
  7. 20 minutes before the end of the cooking time, remove the baking paper and sprinkle the vegetables with a spoonful of olive oil. Continue cooking until the vegetables are tender and golden.