In a small bowl gently stir together the slaw ingredients, refrigerate until chilled.
In a small bowl whisk together cornstarch, cumin, salt, pepper, smoked paprika, chili powder, garlic powder, onion powder, brown sugar, cayenne, beer and tomato paste.
Add the chicken to a slow cooker, pour the beer mixture over the chicken.
Cook on low for 6 hours or until chicken is cooked through. Stir at least once during cooking.
Spoon chicken into tortillas, top with slaw.