1 Heat the canola in a medium-sized saucepan over medium-high heat. Add the cumin seeds. Allow them to sizzle, turn reddish-brown, and smell fragrant, 10 to 15 seconds. Add the onion and stir-fry until they are light brown around the edges, 2 to 4 minutes.2 Stir in the tomato, chilis, garam masala, salt and tumeric. Simmer on medium heat, stirring occasionally, to soften the tomato, about 5 minutes.3 Add the peas and water. Bring them to a boil. Continue to simmer it vigorously on medium heat, uncovered, stirring occasionally, until the sauce slightly thickens and the peas have had a chance to absorb the potent flavors, about 15 minutes.4 While the peas simmer, heat the canola in a wok or a deep skillet over medium-high heat. Add the ginger and stir-fry until lightly brown and aromatic, about 1 minute.5 Grab handfuls of the mustard greens and stir-fry them until they wilt, about 1 minute for each handful. Once they all wilt, continue to cook them, uncovered, stirring occasionally, until all the water leached from the greens evaporate, 8 to 10 minutes.6 Stir this into the pot of stewed peas and serve.