Toss the shallots, garlic and thyme. Cook, stirring frequently, until the shallots and garlic are fragrant, for about 1 minute. Add the Worcestershire sauce and cook for about 1 minute. Pour in the meat broth, espresso powder, chipotle, and mix. Taste it and season with salt and pepper, if necessary. Take it to a boil, turn down the heat and continue cooking to reduce the sauce, for about 10 - 15 minutes.