The first sign of a tomatillo that is not as fresh is the shrivelled and browning papery husk that envelops the tomatillo. The cape should be bright green and it should fully encase the fruit snugly. Should it look like it’s loose and dry, you may not wish to purchase those. The green fruit itself should be plump, and bright green without any dark spots. They should be firm to touch rather than soft and mushy.