In a medium bowl, combine the butter, miso, sriracha, and ginger. Mash together with a fork until the mixture is well combined. Scoop the mixture onto a piece of plastic wrap and roll it into a log. Place it in the fridge for at least 30 minutes before using to allow it to firm up.
To cook the vegetables, melt 2 tablespoons of the miso butter in a large skillet over medium heat. Add the peas and asparagus to the pan and sauté, stirring frequently, for 6-8 minutes, or until the peas are heated through and the asparagus is slightly tender. Transfer the peas and asparagus to a serving bowl and, while still hot, toss with another 1-2 tablespoons of the butter, according to taste. Serve warm.
Notes
Leftover miso butter can be used to spread on toast, mix into scrambled eggs, or tossed with just about any vegetable to add extra flavor before serving.
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