Trim asparagus and steam until tender-crisp, 3 to 4 minutes. Cut into 3 cm lengths. Cook pasta, drain and place in a warmed, large serving bowl; toss with oil. Add asparagus, lemon zest, lemon juice, salt, pepper, roasted peppers (if using) and pine nuts. Gently toss to mix. Add cheese and toss; taste and adjust seasonings. Serve immediately.