How to Make It
Warm the olive oil in a skillet on medium heat for a minute, then add the onion. Sauté the onion until softened, about 4 minutes. Add the chopped garlic and jalapeño and sauté until fragrant, about 1 minute.
Add the ground beef and seasonings and cook until mostly done, about 6 minutes, stirring frequently so the ground beef doesn’t clump.
Add the collard greens and tomatoes and sauté until the collard greens are wilted, about 4 minutes. Stir everything around carefully as it cooks; be sure to do this step gently to avoid mushing the tomatoes.
Add the lemon juice and season to taste by adding salt and pepper as needed. Serve immediately.