Grilled Grass-Fed Beef Burger with Caramelized Onions and Aged Cheddar

By AislePrompt Editorial · Published 2026-05-05 · Updated 2026-05-05

How this recipe was made — this recipe was drafted by AislePrompt's AI-assisted pipeline from technique templates and USDA-sourced nutrition data, and published by AislePrompt Editorial — see how AislePrompt recipes are developed and reviewed.

Juicy grass-fed beef burgers grilled to perfection, topped with sweet caramelized onions and sharp aged cheddar on a toasted bun. This American-inspired meal-prep recipe, ready in about 25 minutes, pairs grass-fed ground beef, salt, black pepper for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 550 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 10 min Cook: 15 min Serves 4 American cuisine 550 cal/serving

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Ingredients

1 lb grass-fed ground beef
1 tsp salt
1/2 tsp black pepper
1 tbsp olive oil
1 large yellow onion, thinly sliced
4 cheddar cheese slices
4 burger buns
4 lettuce leaves
4 tomato slices
1/4 cup mayonnaise
2 tbsp mustard

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Instructions

Step 1: Preheat grill to medium-high heat. In a bowl, gently mix 1 lb grass-fed ground beef with 1 tsp salt and 1/2 tsp black pepper, forming 4 even patties about 3/4 inch thick.
Step 2: Heat 1 tbsp olive oil in a skillet over medium heat. Add 1 large thinly sliced yellow onion and cook, stirring frequently, for 12-15 minutes until soft and caramelized with golden edges.
Step 3: Place the beef patties on the grill and cook for 4-5 minutes per side for medium doneness. In the last minute, top each patty with a slice of cheddar cheese and close the grill lid to melt.
Step 4: Lightly toast 4 burger buns on the grill for 1 minute until golden.
Step 5: Spread 1/4 cup mayonnaise mixed with 2 tbsp mustard on the bottom buns. Layer lettuce leaves, tomato slices, the cheeseburger patties, and caramelized onions. Top with the bun tops and serve immediately.