Hi Bill, I try to find a roast that has a thick fat cap and if it has the skin still on even better.
I score the fat cap in both directions ( cross score ) and in a large pot i put about an inch of water in the pot and bring to a boil , place the roast in fat side down for about 20 minutes.
Bring out and dry off, I rub the raost all over with my spices and oil--- BUT -- not the fat top , I just give it a good heavy shake of salt
Put this in my pan with my sauted veg and broth and beer at 350 deg. for about 45 minutes to an hour
Bring out remove from the pan of broth and veg, put back in oven at 425 - 450 deg for about 30 minutes, this should give you a great crunchy loud top skin. ( watch the skin in the last step, depends on your oven )
Once i also had to just take my cooking torch to the top for a little browning crunch. most times not.
this is a guide line to go with, hope it helps.
David