Ottolenghi's Perfect Lettuce Salad

Name: Ottolenghi's Perfect Lettuce Salad
Prep time: 30 min
Total time: 30 min
Cuisine: European
Ingredients: 1 small head butter lettuce, torn, washed, and spun dry; 1/2 head green or red leaf lettuce, torn, washed, and spun dry; 1 small head radicchio, core removed and thinly sliced; 3 green onions, thinly sliced on an angle; 1 bunch radishes, cleaned and cut into half-moon slices; 1 cup (or more) cherry tomatoes, cut in half; 2-3 T capers; 1 garlic clove, crushed; 1 1/2 T fresh-squeezed lemon juice; 1/2 tsp. caper brine; 1 1/2 T olive oil; 1 1/2 T grapeseed oil; salt and fresh ground black pepper to taste