Using a sharp knife, cut the lamb into bite size pieces and put into a shallow dish.
Thread onto the skewers.
In a separate bowl, stir together fennel seeds, galangal, cumin, lemon, vinegar, olive oil, rosemary, mint, yogurt, evaporated milk, salt, and pepper.
Pour over the lamb pieces, and mix to coat meat.
Reserve 2 tablespoons of marinade.
Cover and refrigerate for at least 4 hours.
Preheat outdoor grill on medium-high heat.
Cook the kabobs for 6-8 minutes, turning half way through.
Transfer the kabobs to a serving platter and drizzle with remaining yogurt sauce.
Garnish with lemon wedges.
Serve warm.