How to Make It
Preheat oven to 350°F. Lightly grease an 8 1/2- x 4 1/2-inch loaf pan with softened butter, and line with parchment paper leaving a 1 1/2-inch overhang to use as “handles” later.
Beat together butter and turmeric with a hand mixer on medium-high speed in a large bowl, until fluffy, 2 to 3 minutes. Add sugar, and continue to beat on medium-high speed 3 minutes. Add eggs, 1 at a time, and beat on medium speed until just blended. Add bananas and vanilla to bowl; beat until just combined.
Whisk together flour, baking soda, cardamom, and salt in a medium bowl. Stir flour mixture into banana mixture by hand until no streaks of dry flour remain; do not overmix. Pour batter into prepared loaf pan. Sprinkle pine nuts evenly over top of batter.
Bake in preheated oven until a wooden skewer inserted into center comes out clean, 55 to 60 minutes. (Tent with aluminum foil if top gets too dark before cooked through.) Cool in pan 15 minutes; remove from pan. Cool completely on a wire rack. Serve Turmeric Banana Bread with Golden Turmeric Butter.