Render fat in a small pan over medium heat; discard solids and reserve fat for sweet potato fries.
Cut the ribs into individual riblets.
In a bag or bowl, combine lemon zest, dried mint, and cumin to make a dry rub for ribs.
Add olive oil, ribs, salt, and pepper to the bowl or bag and toss to combine.
Transfer seasoned ribs to a lined baking sheet.
Bake for one hour or until cooked but not falling off the bone.
Heat rendered lamb fat and vegetable oil (if needed) to 350 F (175 C). When hot, fry the sweet potatoes for three to four minutes, until cooked through and lightly crisped.
Season the sweet potato fries with salt.
In a small bowl, whisk together honey and lemon juice.
Drizzle honey lemon mixture over lamb and sweet potatoes to serve, garnish with fresh mint.