MELT BUTTER AND OLIVE OIL IN A LARGE PAN, ADD DICED ONIONS. MIX AND COOK ON MEDIUM LOW, STIRRING FOR 15 MINUTES WITH A PINCH OF SALT.
ADD 4 TABLESPOONS WATER, 1 AT A ATIME, MIXING UNTIL ALL THE WATER HAS EVAPORATED ON LOW HEAT (SHOULD TAKE A TOTAL OF 10 MINUTES).
ADD MINCED GARLIC AND COOK 1 MINUTE. MIX MISO PASTE WITH 2 TABLESPOONS WATER UNTIL SMOOTH. ADD TO THE PAN AND MIX IN.
REMOVE AND COOL ONION MIXTURE. ONCE COOL, COMBINE WITH THE REST OF THE INGREDIENT LIST.
GARNISH DIP WITH FRESH CHIVES AND CHUNKY SEA SALT.
SERVE WITH SALTY RIDGE WAVY CHIPS, TOASTED BAGUETTE, OR VEGGIE STICKS.