In a medium bowl, whisk together the olive oil, red wine vinegar, lemon juice, minced shallot, minced garlic, salt, black pepper, and red chili flakes (if using).
2 tbsp olive oil, 1 tbsp red wine vinegar, 1 tbsp lemon juice, 1 tbsp shallot, 1 tsp garlic, ⅛ tsp salt, 1 pinch pepper, ¼ tsp red chili flakes