Shepherd's Roast With Drunken Sauce

• 8 tequila
• 5 leg of lamb
• 4 chili pasillas (dried)
• 2 garlic (cloves)
• 2 pickled serrano chilies
• 1 onion
• 350 ml tepid water
• 120 ml olive oil
• 34 gr chili powder
• 30 gr dry cheese (grated)