Mus-Sa-Mun curry(Thadapetch) help

So, I really love the Gaeng Mus-sa-mun at Thadapetch in Leesville. I assume this is the same as massaman curry. If so, any of you know of or have a simple recipe? The ones I am finding require many ingredients we don't normally keep on hand. I've tried the Thai in a box stuff I can find at Kroger, and wasn't thrilled with the outcome. If not simple, then any recommendation would be great. Thanks.