Microwave onions ,chili powder, oil, garlic, coriander, cumin, and cayenne in a bowl, stirring occasionally, until onions are softened, about 5 minutes; transfer to slow cooker. (You can do this the night before to make it easier to put together in the morning). (ATK used 6 qt cookers, I used a 5 qt and I think a 4 qt is large enough).
Stir tomato sauce and sugar into slow cooker.
Season beef with salt and pepper add to slow cooker and coat evenly with the sauce.
Cover and cook on Low for 9 to 11 hours, or High for 5 to 7 hours.
Transfer beef to a large bowl let cool slightly, then shred in bite-sized pieces, discarding excess fat; cover to keep warm.
Let braising liquid settle and spoon off fat from surface with a large spoon.
Toss shredded beef with 1 cup of the braising liquid, adding more liquid as necessary. Stir in the lime juice and season with additional salt and pepper.
Refrigerate leftovers for up to 3 days or freeze for up to 1 month.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	152.58 Kcal (639 kJ)
Calories from fat	107.43 Kcal
		% Daily Value*
Total Fat	11.94g	18%
Cholesterol	34.99mg	12%
Sodium	74.9mg	3%
Potassium	184.36mg	4%
Total Carbs	2.26g	1%
Sugars	0.73g	3%
Dietary Fiber	0.76g	3%
Protein	8.64g	17%
Vitamin C	1.4mg	2%
Iron	1.4mg	8%
Calcium	15.9mg	2%

Amount Per 100 g
Calories	245.64 Kcal (1028 kJ)
Calories from fat	172.95 Kcal
		% Daily Value*
Total Fat	19.22g	18%
Cholesterol	56.33mg	12%
Sodium	120.58mg	3%
Potassium	296.8mg	4%
Total Carbs	3.65g	1%
Sugars	1.17g	3%
Dietary Fiber	1.22g	3%
Protein	13.91g	17%
Vitamin C	2.3mg	2%
Iron	2.3mg	8%
Calcium	25.6mg	2%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.