Red Onion and Feta Salad with Lemon Vinaigrette

By Lauren Mitchell, Test Kitchen Director · Reviewed by AislePrompt Editorial · Published 2026-06-18 · Updated 2026-06-18

A refreshing salad combining crisp red onions, creamy feta, and a bright lemon vinaigrette, perfect for a light lunch or side dish. This mediterranean-inspired salads (vegetarian) ready in about 10 minutes pairs large red onion, thinly sliced, romaine lettuce, chopped, feta cheese, crumbled into a side that holds its own next to almost any main — bright, balanced, and quick enough to slot into a weeknight plate. Each serving lands at about 180 calories and feeds 4, so it slots cleanly next to roasted proteins, grain bowls, or weeknight mains. 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.

Ingredients

• 1 large red onion, thinly sliced
• 4 cups romaine lettuce, chopped
• 1/2 cup feta cheese, crumbled
• 1 cup cherry tomatoes, halved
• 1 medium cucumber, diced
• 3 tbsp olive oil
• 2 tbsp fresh lemon juice
• 1 tsp honey
• 1/2 tsp dijon mustard
• 1/2 tsp salt
• 1/4 tsp black pepper
• 2 tbsp fresh parsley, chopped

Instructions

1. Step 1: In a large salad bowl, combine 1 large thinly sliced red onion, 4 cups chopped romaine lettuce, 1 cup halved cherry tomatoes, 1 medium diced cucumber, and 1/2 cup crumbled feta cheese.
2. Step 2: In a small bowl, whisk together 3 tbsp olive oil, 2 tbsp fresh lemon juice, 1 tsp honey, 1/2 tsp dijon mustard, 1/2 tsp salt, and 1/4 tsp black pepper until emulsified.
3. Step 3: Pour the lemon vinaigrette over the salad and toss gently to coat all ingredients evenly.
4. Step 4: Sprinkle 2 tbsp chopped fresh parsley on top before serving to add a fresh herbal note.