1 Rinse turkey cutlets, pat dry and cut each lengthwise into 5 strips.
2 Thread each strip on a wooden skewer, folding turkey back and forth as you go. Place the skewers in a large shallow baking dish.
3 Cut lime in half and squeeze. Put 2 tablespoons juice in a bowl. Peel the garlic and squeeze through a garlic press into lime juice.
4 Add soy sauce and sesame oil to bowl. Brush on turkey skewers to coat and let marinate for at least 1 hour in the refrigerator.
5 Meanwhile, peel and chop the onions and combine with broth in a small pot. Bring to a boil. Cover and cook on low heat until the onions are falling-apart tender, about 20 minutes.
6 Stir peanut butter and sugar into the onion mixture. Season with salt, pepper flakes and 1-2 tablespoons lime juice. Thin with a little vegetable broth, if needed, and let cool.
7 Remove turkey skewers from marinade and let drain slightly. Place in a large aluminum pan and grill for 8-10 minutes on a hot grill, turning regularly and brushing with a little more marinade. Serve with the peanut sauce.