(this saag has ginger, fennel, and black cumin)

1 tbsp oil
1 tbsp butter
1/2 tsp fennel seeds
1 tsp black cumin seeds
1-2 onions, cut into thin fine half-rings
1 inch piece of ginger, cut into thin strips
1 lb spinach (or scale everything down; I've only made this with 1lb)
1 hot long green chili or 1/3 jalapeno
1 tsp salt, or to taste
1/8 tsp cayenne pepper

Heat oil and butter on medium-high. Add seeds, stir. Add onions and ginger, stir fry until rich and brown. Add spinach, cover and let it wilt, then turn heat to medium. Add chili, salt, and cayenne, stir for 10-20 minutes, covered at first then uncovered to evaporate liquid.

Source: Madhur Jaffrey's Spice Kitchen