Combine the ketchup, ginger, garlic, Melba sauce, sugar, honey, orange juice, Triple Sec, Worcestershire sauce, soy sauce, vinegar, zest, spring onions, chipotle, allspice, salt in a saucepan and bring to a boil, stirring constantly.
Reduce heat and simmer stirring occasionally, for 30 minutes.
Strain and remove the spring onions.
Whichever cut of lamb that you wish to use, trim as desired.
Season the meat on all sides and barbecue, grill or smoke.
Remember when direct grilling and using this seasoning to turn the meat often so it doesn't caramelize.
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