
Heat oil in a deep 12-inch heavy skillet over moderately
high heat
until hot but not smoking, then saute onion, stirring
occasionally,
until golden, about 8 minutes. Add bell peppers
and saute, stirring
occasionally, until softened, about 6 minutes.
Add chili powder,
cocoa, salt, cinnamon, and pepper and cook, stirring,
about 1 minute.
Add beef and cook, stirring and breaking up lumps,
until no longer
pink, about 5 minutes. Add tomatoes with juice
and molasses and
simmer briskly, uncovered, stirring occasionally,
until thickened,
5 to 8 minutes.
