Foryoueats: Slow-Cooker Beef Chili

1 tbsp. vegetable or canola oil

1 large yellow onion, chopped (about 1 1/2 c.)

Kosher salt

4 cloves garlic, finely chopped

2 tbsp. tomato paste

2 lb. (85% lean) ground beef

Freshly ground black pepper

1 tbsp. cocoa powder

1 tbsp. ground cumin

2 tsp. smoked paprika

Pinch of cayenne pepper or chipotle chili powder (optional)

2 (15-oz.) cans kidney beans, drained, rinsed

1 (28-oz.) can crushed tomatoes

1 c. beer, low-sodium beef broth, or water

1 lime, halved

Slow-Cooker Beef Chili