Deviled Eggs with Lemon Zest, Chives and Capers

6 eggs 

1 Tbs. Dijon mustard 

1 Tbs. mayonnaise 

1/2 tsp. salt 

1/2 tsp. freshly ground pepper 

2 Tbs. minced fresh chives 

1 tsp. minced shallots 

1 1/2 Tbs. capers, rinsed, drained, patted dry and coarsely chopped 

2 tsp. grated lemon zest