You could certainly make a savory tart crust from scratch; the recipe below from Emeril has instructions for just that. But a frozen puff pastry bakes up into such lovely, buttery layers... It's hard to resist.
These tarts can be as complicated or as basic as you want. Most involve nothing more than beating together some egg and cheese and pouring them over blanched asparagus that have been lined up like little soldiers on top of the pastry. Add bacon or slices of ham, and you've got a full meal. We also think one of these tarts would be a great appetizer if you cut it into squares.
Some recipes to check out:
• Asparagus-Ricotta Tart with Comte Cheese, from Bon Appétit (above)
• Asparagus Gruyere Tart, from Everyday Food (below)
• Asparagus Tart with Vacherin Cheese, from Emeril Lagasse
• Asparagus and Strawberry Tart (a very intriguing combination), at La Tartine Gourmande