Ubi Jalar Panggang Lambat Fondant - dengan Pecan Mentega Maple

Bahan-bahan (6 porsi)

• 1.5 kg / 3 lb sweet potatoes - 3 thick ones ((Note 1))
• 25 g / 1 1/2 tbsp butter (, unsalted, melted (Note 2))
• 1 1/2 tbsp olive oil ((Note 2))
• 3/4 tsp salt (, kosher/cooking (1/2 tsp table salt))
• 1/2 tsp black pepper
• 1 1/4 cups chicken stock (, low sodium (or vegetable stock))
• 1 g arlic clove (, finely minced)
• 1/2 cup maple syrup ((pure, Note 3))
• 30 g / 2 tbsp butter (, unsalted)
• 1/3 cup pecans (, chopped (Note 4))
• 1/2 tsp cinnamon
• Pinch of salt
• 1 1/2 tsp fresh thyme leaves ((highly recommended))