In a medium pot, heat mustard seeds over medium heat until they begin to pop, 2 to 3 minutes. Carefully add broth, 1 cup water, onion, lentils and garlic and bring to a boil. Reduce heat to medium-low, cover and simmer until lentils are very tender and falling apart, about 20 minutes. Remove from heat, add lemon juice and stir until lentils break apart to make a sauce. Meanwhile, bring a large pot of water to a boil. Add linguine and cook until al dente, 8 to 10 minutes; drain and return to pot. Immediately add spinach, artichoke hearts and lentil sauce to hot pasta, toss well and serve.
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