Classic Spinach Dip
Heat oil in a large non-stick saucepan over medium-high heat. Cook onion, stirring occasionally, until soft and starting to turn golden, 5 to 8 min.
Add spinach and cook until wilted, about 2 min. Set aside in fridge to cool completely, about 15 min.
Place spinach mixture in bowl of food processor. Add mayonnaise, sour cream, lemon juice, salt and pepper. Blend until smooth, about 30 sec.