Cook the shoulder, according to the recipe here. Make the spice mix, by toasting the spices briefly and then crushing in a pestle and mortar or a spice blender (lightly crushed, not a dust).
Make the dressing by combining the liquids in a small bowl and seasoning to taste with more lime / meat juices.
Prep the accompanying salad ingredients above, this works well with whatever you have in your fridge that is seasonal, green beans, cherry tomatoes, asparagus tips etc.
Toss the salad before serving, coating in the dressing and finishing with a sprinkling of spice mix.