Add the spinach and cook, stirring, just until the spinach has barely wilted. Promptly remove the skillet from the heat.
Add the lemon juice, salt and red pepper flakes, stir with tongs to mix, then place spinach in a colander. Place the colander over a bowl and chill in fridge for about 1 hour, allowing liquid to drain.
Plate chilled spinach, top with pine nuts and serve.
Recipe by Liz The Chef at https://lizthechef.com/chilled-sesame-spinach/