HEAT OIL IN A DUTCH OVEN OR LARGE POT OVER MEDIUM HEAT. ADD ONION AND COOK UNTIL TRANSLUCENT.
ADD GARLIC AND COOK UNTIL FRAGRANT, ABOUT 1 MINUTE. ADD BUTTER; ONCE BUTTER IS JUST MELTED, ADD HERBS. CONTINUE COOKING UNTIL ONIONS ARE GOLDEN IN COLOR.
ADD LEMON JUICE AND VEGETABLE BROTH. BRING TO A BOIL THEN REDUCE HEAT TO LOW. COOK UNCOVERED FOR 12-15 MINUTES.
ADD CANNELLINI BEANS AND KALE. STIR TO INCORPORATE AND SIMMER FOR 5-7 MINUTES. ADD SALT AND PEPPER, TO TASTE, BEFORE SERVING.