While red and green curry pastes require hard to find ingredients like kaffir lime zest and cilantro roots, Massaman curry paste's ingredients are easy to find. Most ingredients are available at most grocery stores, especially at Indian markets.
Compared to other Thai curries, the distinct characteristic of massaman curry paste is that all ingredients are roasted prior to pounding/grinding. When all the spices are roasted and the aroma fills your kitchen, the real work begins: pounding. When you finally grind everything in your mortar, I promise you the wonderful fragrance from all the spices will fill your kitchen!
A word of caution for making this Massaman Curry Paste, you will not be satisfied with a store-bought massaman curry paste again.